DNS Perl Raspberry Pi

Domain Services: does Backorder work?


This is a memoir of my personal experience with trying to obtain a DNS domain that was registered by another person and about to expire. Plus some technical discussion of how whois on linux probably works.

The details

I’ve been watching a particular domain for years now. It’s always been registered at auction sites, and has changed hands at least once, maybe even twice. So i was excited this year when it was about to expire at the end of September. I kept checking via linux whois – figuring, or really more like hoping, that a direct query to the authoritative whois server would not tip off the owner if it were done outside of a web page. The linux command is whois -h (ok, that is not the real domain, just using it for the sake of preserving anonymitiy).

So about 10 days after it “expired” – at which point I believe it is very easy for the owner to still renew it – I wanted to increase my chances so I decided to make a bid for it, figuring, the owner would face either my offer or the prospect of getting nothing for the domain or shelling out for the renewal. So I offered $150 which is what it’s worth to me.

To my surprise I got a return email:

Hello John,
Thanks for the inquiry.
This seller will not sell for less than $10K. What is your budget?


Wow, right? Then I thought for a few minutes? I’ve seen this before – at work. There was this no-name domain which matched something the marketing folks were planning, so we made an offer through a third-party service. The response was to the effect, The seller is not interested in selling, but for $47,000 you could buy it. WTF. You can’t make this stuff up. I don’t have a lot of respect for domainers because frankly, almost all my interactions have been negative. Consider the evidence. At work I constantly get unsolicited offers for The emails always come from different email addresses to avoid spam filters. That is cyber-squatting. Deplorable. I once got an unsolicited offer for a domain similar to one we owned (without the “s”). I checked it and found it wasn’t even registered! So that con artist was trying to take advantage of our naivete. Scum. Then a month ago I was offered some $ for any GoDaddy account which had been registered years ago and so had access to its API auction service, which you apparently cannot get any longer. Sounds like an invitation to violate the terms of service to me – another dodgy tactic.

So I thought about that statement and decided, that’s just a negotiating tactic to make me cower and think unless I raised my offer to, say, $1000, I wouldn’t stand a chance. I decided not to cave. I am the world’s worst negotiator but here I felt I had somewhat a position of strength given my tepid feelings about the domain and the fact that it had officially expired. My – somewhat flip – response:

Hi Christina,
Thanks for the response. Well, I am content to see it expire so the seller gets $0. I know it’s been doing nothing for years now. I am a private person with no commercial interest in development of the domain. My budget is $200.

Christina’s response:

Thanks John.
I hear you.
I advise you to get the refundable exclusive backorder.
Just buy it and then don’t check it.

So now this Christina lady sounds like she’s on my side seeing I wasn’t a big bucks buyer. At some point it’s a matter of trust. So I plunk down $200 for their backorder service and wait and don’t check.

Christina sends me this encouraging note:

If you cancel the backorder, the fee is refunded.
And checking WHOIS is data we collect and which the registrant can see.
So, best to wait patiently.

She encourages me to be super patient and asks what my plans are for it. My response:

Hi Christina,
Bragging rights at family gatherings, etc.
Then I’ll think about more ambitious things like a private social media site, but I doubt I’ll go there.

So how did it end up?

Not so good. I eventually broke down and did a single whois check after a couple weeks and found the domain had been renewed. Foiled once again, and out the $200 backorder fee.*

*Technically not out since Christina also said it was refundable. I’m just going to sit on it until next year, and the year after that, …

What is that business model?

I had plenty of days to think about it, and I was trying to square two irreconcilable facts. 1) The seller was going to hold out for big money for a worthless domain, thereby losing money. 2) Yet, presumably, the seller is overall making money. Hmm. So I came up with this hypothesis.

Although to an outsider like myself the seller’s approach is irrational, I have a hypothesis for a business model which could justify it.
My hypothesis for a business model that supports such behavior is that some domainers own hundreds or even thousands of seemingly low-value domains – a domain farm – which they patiently cultivate. In the Internet there is commonly seen the long-tail phenomenon. Chris Anderson described it in a book. So instead of following a normal distribution around the nominal value of an unlikely-sounding domain, the actual value distribution has a long tail on the upside. So, if one owns enough domains, although any one may never get the big offer, it only takes a few big ones a year to hit, make up for all the losers and create positive cash flow. After all a domain is really worth what a buyer is willing to pay, not what the algorithms judge them to be worth. Some people will be willing to pay big.

An industry insider I contacted demurred when asked for confirmation or denial of my hypothesis, but insteadpointed me to this link: . If I understand it correctly, chapter 7, The domain Name Aftermarket, addresses this scenario. But it says it basically doesn’t work the way that I hypothesized. And that plus the other chapters in total present a much, much more complex story. There are business models, of course, but, well, just read it for yourself. I don’t care. I still like my domain farm plus long valuation tail concept.

About whois on linux

I need to investigate further what goes on when a simple whois lookup is done. Like everything, there’s a lot of history and it’s not so straightforward. This somewhat outdated article seems to cover it really well: . I’m still digesting it myself. I’ve done a trace on port 43 for a whois lookup of and see somewhat confounding results – it’s talking to two whois servers, a Verisign one ( or similar), which provides some minimal information, and one which refuses to provide any information – (GoDaddy is the registrar for this domain). My tenuous conclusion is that whois to Verisign does a static lookup and Verisign has a database which covers all of the .com domains with basic information. More detailed information can be provided by the actual registrar for that domain. But GoDaddy refuses to do that. However, it appears other registrars do accept these requests for details! In particular the registrars which are used by domainers to park their domains. Hence it is entirely possible, even from packet analysis, that a registrar gets tipped off by a linux command-line whois lookup (and therefore could provide metrics back to the registrant about these occurrences.)

Double however

I did still more research on whois, i.e., RTFM type stuff. It looks like there are switches which should turn off lookups on other server, like -r or -R, but when you try them they don’t actually work. But, I enabled verbose mode which shows you the whois servers being queried – no need to do a laborious packet trace – and I discovered that if you run the command this way:

$ whois –verbose -h <domain_name>

then the query stays with Verisign’s whois server and there is no data leakage or data sharing with the actual registrar! So, mission accomplished. Note that the Verisign whois server probably only covers .com and .net gTLDs. For others like .io, .us, .info you have to figure out the principal whois server for yourself. Or ask for help in the comments section.

drjwhois makes it easier

I decided to write my own wrapper for whois to make this easier for anyone going down this path. Just bear in mind its limited applicability. It’s aimed at people interested in a domain, probably one on the after market, where they want to know if it’s about to expire or has actually expired, without tipping off the seller. As I said I call it drjwhois.

# DrJ's wrapper for whois - prevents data leakage
# Drj 11/20
$DEBUG = 0;
$domain = lc $ARGV[0];
# These are just the TLDs I consider the most important. Obviously there are thousands. Many do not have a resale market.
#to find the whois server just run whois --verbose
$BIZ = "";
$BR = "";
$CA = "";
$CO = "";
$DE = ""; # de but whois server does not reveal anything! Must use their web site.
$ENOM = ""; # biz
$IE = "";
$IN = "";
$INFO = "";
$IO = "";
$ME = "";
$ORG = "";
$RU = "";
$US = "";
$Verisign = ""; # com, net, edu
%TLDs = ('biz',$BIZ,'br',$BR,'ca',$CA,'com',$Verisign,'me',$ME,'net',$Verisign,'edu',$Verisign,'ie',$IE,'io',$IO,'co',$CO,
if ($DEBUG) {
  foreach $key (keys %TLDs) {
    print $key . " " . $TLDs{"$key"} . "\n";
$_ = $domain;
($tld) = /.([^.]+)$/;
print qq(Domain:\t\t$domain
WHOIS server:\t$TLDs{$tld}\n\n);
#$result = whois -h $TLDs{$tld} $domain;
#print $result;
unless ($TLDs{$tld}) {
  print "drjwhois has no information about this TLD. Instead use whois $domain\n";
open(WHOIS,"whois -h $TLDs{$tld} $domain|") || die "Cannot launch whois -h $TLDs{$tld} $domain!!\n";
while(<WHOIS>) {
  if (/(whois|expir|paid|renewal)/i) {
    print ;
    $exists = 1;
print "Domain $domain appears to be unregistered!\n" unless $exists;
print qq(\n\ndrjwhois is designed to only show information about the expiration
date of a domain, and if it has become unregistered, all without
leaking the query to aftermarket sellers such as Sedo, Epik, enom, etc.
If you want full information just use whois $domain

Example usage

$ drjwhois

TLD:    com
WHOIS server:

Registrar WHOIS Server:
Registry Expiry Date: 2021-04-23T00:54:17Z
NOTICE: The expiration date displayed in this record is the date the
currently set to expire. This date does not necessarily reflect the expiration
view the registrar's reported date of expiration for this registration.

drjwhois is designed to only show information about the expiration
date of a domain, and if it has become unregistered, all without
leaking the query to aftermarket sellers such as Sedo, Epik, enom, etc.
If you want full information just use whois

Anyway, I say the write-up is outdated because it’s a lot harder than it was a few years ago to get the registrant information. ICANN was chastened I believe by GDPR (data privacy) concerns and so most of the registrant’s personal details has been yanked, generally speaking. But there are left a few valuable nuggets of information.

How about all those nice web interfaces to whois?

I would personally avoid all the web interfaces registrars offer to whois – they seem to be run by the sales and marketing departments without exception. They almost guarantee data sharing with the registrant in addition to selling you services you don’t want.


My guess is that backorders rarely work out. Mine certainly didn’t. But if you like gambling it has a certain thrill to it since you never know…

If you want to play with the big boys and girls and make some money from buying and selling domains, my impression is that Epik is an honest broker, and that’s important to have when so many are not above coloring outside the lines in this business.

linux whois does indeed provide a way to avoid having your interest in a domain leak out to the owner. Use whois -h <domain_name> and you are not giving yourself away.

References and related

An old blog post of mine which describes writing a program to GoDaddy’s api for buying a domain as soon as it becomes available.

Whois – what goes on behind the scenes during a whois lookup:

Best resource I am aware of which covers the strange virtual world of buying and selling domains for a living.:

If you’re dying to try out whois on linux but don’t have access to linux, you could either get a Raspberry Pi, though there is some set up and cost involved there, or install Cygwin on Windows 10, though there is some setup involved in getting the package setup, but at least there’s no cost.

On Centos linux, Raspbian (used by Raspberry Pi) and Cygwin, whois is its own package. On my Centos 8 server it is whois-5.5.1-2.

Admin Linux

Getting GNU screen to work on Windows 10 for a productive terminal multiplex environment

My jump server is getting old and they’re threatening to cut it off. A jump server is a server from which you launch CLI terminal sessions into your linux servers. Since my laptop has firewall access to all the same servers I wondered if I could build up a productive environment right within Windows 10 on my own laptop. For me this would be running GNU screen as a terminal multiplexer since I hop between terminal screens all day.

More details
Windows 10 is coming around to more fully integrating with Linux! it’s about time. WSL, windows subsystem for Linux, is all about that. And things like bash shell, ubuntu and OpenUSE Linux are available from the windows store. But that was not an option for me. My organizaiton has shut all that down.

So I thought back to my days as a Cygwin user those many years ago… Could I get GNU screen running within Cygwin environment on Windows 10? Well, yes, I can with just a few tweaks.

I think the initial Cygwin install required admin privileges, but once installed to run it does not.

Within Cygwin screen is an optional package and you can run their setup program to search and install it.

Here is my .screenrc file

defscrollback 4000
#change init sequence to not switch width
termcapinfo  xterm Z0=\E[?3h:Z1=\E[?3l:is=\E[r\E[m\E[2J\E[H\E[?7h\E[?1;4;6l
# Make the output buffer large for (fast) xterms.
termcapinfo xterm* OL=10000
# tell screen that xterm can switch to dark background and has function
# keys.
termcapinfo xterm 'VR=\E[?5h:VN=\E[?5l'
termcapinfo xterm 'k1=\E[11~:k2=\E[12~:k3=\E[13~:k4=\E[14~'
termcapinfo xterm 'kh=\E[1~:kI=\E[2~:kD=\E[3~:kH=\E[4~:kP=\E[H:kN=\E[6~'
# special xterm hardstatus: use the window title.
termcapinfo xterm 'hs:ts=\E]2;:fs=\007:ds=\E]2;screen\007'
#terminfo xterm 'vb=\E[?5h

lt;200/&gt;\E[?5l' termcapinfo xterm 'vi=\E[?25l:ve=\E[34h\E[?25h:vs=\E[34l' # emulate part of the 'K' charset termcapinfo xterm 'XC=K%,%\E(B,[\304,\\\\\326,]\334,{\344,|\366,}\374,~\337' # xterm-52 tweaks: # - uses background color for delete operations termcapinfo xterm ut #from termcapinfo xterm* ti@:te@ escape ^\\ # changes espace sequence password

Note that in my .screenrc I use <Ctrl-\> as my escape sequence, so, e.g., to pop to the previous screen it is <Ctrl-\> <Ctrl-\>. I’m not sure that’s standard but my fingers will remember that to my dying day. They probably still remember some of those EDT/TPU VAX editor commands to this day!

Compare and contrast
Here are my day 0 observations.

ssh, curl, nslookup and tracert are coming from the underlying Windows system (do a which curl to see that) so that means you get the dumb version your system has.

So there is no dig, and no nc or netcat.

touch, cat, mkdir and vi behave pretty normally. man pages are installed, which can be a help.

If you use proxy, a funny thing can happen and your environment variables can get mixed. You may have inherited an HTTP_PROXY environment variable form the system, but the alias you copied from a linux jump server probably defines an http_proxy environment variable (lower case). And both can co-exist! As to which one curl would then use, who knows? Better just stick to working with the upper-case one and NOT define another in lower case.

For awhile it looked like scrolling was not working at all when screen was running. Then i found that tip I reference at the bottom of my .screenrc file which makes scrolling work via the mouse’s scroll wheel, which isn’t too bad.

Old friends like ls, grep, echo and while (built-in bash command) are available however. dig can be installed from the bind-utils package.

A lot of other packages are optionally available, including a whole X-Windows environment, which I used to run in the past but hope to avoid this time around.

No crontabs however (to have cron daemon requires installing admin privileges) which kind of hurts.

Simple output redirection seems to work, as does job control, e.g.,

ping -t &gt; /dev/null 2&gt;&amp;1 &amp;

Not sure why you’d want to run the above command, but this nice example shows that the /dev/null device exists, and the ping command is inherited from your Windows environment hence the -t option to run it indefinitely, and that it will create a background process which you can view and control with jobs / kill.

Now I typically move my laptop off the work environment each night, so all my ssh logins will be lost, unlike the jump server situation. But our jump server isn’t that stable anyway so no big loss I’d say…

I am sooo used to highlighting text in Teraterm, which is my current environment, and that being sufficient to put that text into the clipboard, that I keep doing that in this environment. But it doesn’t work. I have to use the CMD window convention of highlighting the text and then hitting ENTER to get it into the clipboard. oops. That was because I had been launching Cygwin from a CMD window. Now I am launching from a proper Cygwin shortcut and simple text highlighting works, BUT, right-clicking to paste it in brings up a menu rather than just doing it! So there’s that difference now… Instead of right-click I can quickly paste the text in doing a SHIFT-Insert.

ssh will get you

By default you end up using the Windows-10 supplied ssh, and that works pretty well. But when you’re ready to advance and need to put some thing into a .ssh/config file, forget about it. In principle it’s possible in Windows 10, but it’s too complex. Just install the ssh package. That in turn permits you the facility familiar to you where you can create a ~/.ssh/config file.

How to set your userid by default for your ssh logins

First make sure you install the Cygwin ssh package and are using that one. A which ssh should come back with /usr/bin/ssh.

My config file looks like this:

Host *
User drjohn

That sets my default userid to be drjohn on any random server I ssh to.

New ssh error pops up
Unable to negotiate with port 22: no matching key exchange method found. Their offer: diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1

This only happened when I switched from my Windows ssh to the Cygwin one. This is, of course, when connecting to a system (ironically, a firewall) with an old image. I think the only solution to be able to access these old systems is to switch back to the Windows 10 ssh – after all we never got rid of it and it used to work. Since all my customary ssh’s are aliased, this works well enough. I just made an alias like this

alias oldFW='screen -t oldFW /cygdrive/c/windows/system32/openssh/ssh.exe [email protected]'

since on my system the Windows 10 openssh is installed there in the system32 folder.

How do you get multiple login sessions (shells) within your screen to the localhost?

Well, you can’t just do a su – and you probably don’t have an ssh daemon running locally, so this is more of a non-trivial question than it first appears.

I define a bunch of aliases. My alias for getting an additional shell on the Windows 10 machine is this:

alias local=’screen -t localhost bash –login -i’

A word on package management
I don’t know why I was afraid of installing packages when I first tried Cygwin over a decade ago. Now for me that’s the key – to understand and practice installing packages because it’s actually really easy when you’re used to it.

The key is to simply keep your initial install setup hanging around, setup-x86_64.exe. In my case it’s in my downloads directory. Example usage: I wondered if I could install a decent version of ping rather than continually suffer with the dumb DOS version. So, fire up the above-mentioned executable. Go through a few screens (where it remembers the answers from the initial install), then search for the package (Yes, it’s there!), and select to install the most recent version from the drop-down. A few more clicks and it’s done and available in your path. it’s that easy… Not sure about uninstalling because you almost never need to do that. It seems maybe a thousand packages are available? so no, there’s no yum or zypper or rpm or apt-get, but who really needs those anyway?

As a concrete example, I am learning about SNMP. So I got something running on a Bluecoat proxy, and I wanted to see what I could see. The guide recommended using snmpwalk, which of course I did not have. So I learned which package it is in with a DDG search, then ran the Cygwin setup, found that package, installed it, and voila, there was snmpwalk in my path. And it worked, by the way. Easy peasy.

Creating your own scripts

If you have the funny situation, like me, where you had enough privileges to install Cygwin, perhaps by temporarily assigning your account the Admin role, but when you use it day-to-day, you do not have admin privileges, you will find yourself unable to create files in some of the system directories like /usr/local/bin – permission denied! But in your home directory you will be able to edit files.

So what I did is to create a bin directory under my home directory, where I plan to add my home-grown scripts such as mimeencode, and make sure my PATH includes this directory with a statement like

 export PATH=$PATH:${HOME}/bin

which I put in my .alias file, which in turn I source from .bashrc.

2021 update: The fate of the screen package

I read somewhere the screen utility which I love is beyond repair and will have to be replaced by something else. Too bad. I’ve used it for about 10 years now.

X Windows

In a previous iteration of Cygwin I had installed the X Server components though I left it out this time around. For an X Server running on my PC, which I do need from time-to-time, I use MobaXterm. Seems to work OK for my purposes, which are very minimal. But I prefer to use Cygwin over MobaXterm for the command line stuff I do.

GNU screen for Windows is indeed possible, but you gotta run it on top of Cygwin. It’s of interest that after all these years Cygwin is still viable on Windows 10. Cygwin can be run in a pretty lightweight fashion if you avoid the X-Windows stuff. There are some quirks but it is surprisingly linux-like at the end of the day. I believe it is really suitable as a replacement for a linux jump server. screen, for the uninitiated, is a temrinal multiplexer, which means it makes it very fast for you to switch between multiple terminal windows.

Some things are a bit different.

I think I will use this both at work and at home… Nope! My home PC runs too darn slow to ever use the Cygwin environment. My work laptop has SSD which probably helps keep performance good.

It is possible to set up an ssh default user.

It is possible to create multiple local shells within one screen within one Cygwin terminal.

So it is really possible to have your Linux command line. I use it every day…

2022 update

WSL2 is the way to go now. The setup can be little tricky, however, but it is worth it. You get a full hypervisor environment, not an emulator as you have with Cygwin. I write it up here. 

References and related

(2022) These days, it’s better to skip Cygwin and go straight to a full VM using WSL2.
Here’s the GNU Cygwin home page:

Install Cygwin by running

A newbie’s guide to Cygwin and linux commands: Cygwin Cheat Sheet – Step-by-Step Guide on Installation and Use (

Interesting discussion:

If you have a linux jump server that runs screen, or just want to ssh to a linux server, teraterm can be a good choice (as opposed to putty or built-in ssh). These days it can be found here:

To have an X Server running locally, MobaXterm seems a good choice. It looks like it’s free: