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Thanks to sites like the blog, domain name administrators should be learning that it is important to watch for updates to WHOIS records. Companies like Sucuri offer such a service free for one domain but charge for additional domains while providing extended services. If you'd just like to monitor your own WHOIS records using a simple script, you can be inspired by last year's article by David Davidson.

I decided to create the following simple script to watch two of my domains.

richard@macmini:~/check$ cat check.sh #/bin/sh /usr/bin/whois bejtlich.net > /home/richard/check/bejtlich.net.whois.new.txt /usr/bin/whois taosecurity.com > /home/richard/check/taosecurity.com.whois.new.txt /usr/bin/diff -u /home/richard/check/bejtlich.net.whois.old.txt / /home/richard/check/bejtlich.net.whois.new.txt | mail -s "bejtlich.net whois check" taosecurity@gmail.com /usr/bin/diff -u /home/richard/check/taosecurity.com.whois.old.txt /  /home/richard/check/taosecurity.com.whois.new.txt | mail -s "taosecurity.com whois check" taosecurity@gmail.com mv /home/richard/check/bejtlich.net.whois.new.txt /home/richard/check / /bejtlich.net.whois.old.txt mv /home/richard/check/taosecurity.com.whois.new.txt /home/richard/check / /taosecurity.com.whois.old.txt

Is this the world's greatest shell script? No, I wrote it in 60 seconds to make my point. Feel free to create something uber-cool and post it here. :)Next I created empty files:

$ echo "" > bejtlich.net.whois.old.txt $ echo "" > taosecurity.com.whois.old.txt

Finally I ran the check:

$ ./check.sh

Checking my email, I got two. Here's the one for bejtlich.net:

--- /home/richard/check/bejtlich.net.whois.old.txt      2010-05-22 20:52:58.000000000 -0400 +++ /home/richard/check/bejtlich.net.whois.new.txt      2010-05-22 20:53:05.000000000 -0400 @@ -1 +1,106 @@ +Whois Server Version 2.0 + +Domain names in the .com and .net domains can now be registered +with many different competing registrars. Go to http://www.internic.net +for detailed information. + +   Domain Name: BEJTLICH.NET +   Registrar: GODADDY.COM, INC. +   Whois Server: whois.godaddy.com +   Referral URL: http://registrar.godaddy.com +   Name Server: NS18.ZONEEDIT.COM +   Name Server: NS8.ZONEEDIT.COM +   Status: clientDeleteProhibited +   Status: clientRenewProhibited +   Status: clientTransferProhibited +   Status: clientUpdateProhibited +   Updated Date: 22-may-2010 +   Creation Date: 01-jul-2000 +   Expiration Date: 01-jul-2011 ...truncated...

As you can see it's "all new" because the old file was empty.When I run the check again, I should get no significant changes via email.

--- /home/richard/check/bejtlich.net.whois.old.txt      2010-05-22 20:53:05.000000000 -0400 +++ /home/richard/check/bejtlich.net.whois.new.txt      2010-05-22 20:55:28.000000000 -0400 @@ -19,7 +19,7 @@    Creation Date: 01-jul-2000    Expiration Date: 01-jul-2011 ->>> Last update of whois database: Sun, 23 May 2010 00:52:33 UTC <<< +>>> Last update of whois database: Sun, 23 May 2010 00:54:20 UTC <<< - Hide quoted text -  NOTICE: The expiration date displayed in this record is the date the  registrar's sponsorship of the domain name registration in the registry is

You could argue not to use diff -u to simplify the output. Sure, you could. I just prefer seeing some context when changes do occur.Now I'm going to add another DNS server to my WHOIS record and see if my script catches the change.Reading email...

--- /home/richard/check/bejtlich.net.whois.old.txt      2010-05-22 20:55:28.000000000 -0400 +++ /home/richard/check/bejtlich.net.whois.new.txt      2010-05-22 20:58:09.000000000 -0400 @@ -10,6 +10,7 @@    Whois Server: whois.godaddy.com    Referral URL: http://registrar.godaddy.com    Name Server: NS18.ZONEEDIT.COM +   Name Server: NS5.ZONEEDIT.COM    Name Server: NS8.ZONEEDIT.COM    Status: clientDeleteProhibited    Status: clientRenewProhibited @@ -19,7 +20,7 @@    Creation Date: 01-jul-2000    Expiration Date: 01-jul-2011 ->>> Last update of whois database: Sun, 23 May 2010 00:54:20 UTC <<< +>>> Last update of whois database: Sun, 23 May 2010 00:57:09 UTC <<<  NOTICE: The expiration date displayed in this record is the date the  registrar's sponsorship of the domain name registration in the registry is @@ -103,4 +104,5 @@    Domain servers in listed order:       NS18.ZONEEDIT.COM       NS8.ZONEEDIT.COM +      NS5.ZONEEDIT.COM

There it is -- ns5.zoneedit.com. If I hadn't made that change, then I would know someone has compromised my account.The next evolution of this script is to run it from cron, and better yet modify it so I only get an email if there is a change. For now, I have a simple way to watch for changes. Again, Sucuri should take credit for bringing this to people's attention during the last 2 years or so.

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