Quoting Russell Coker ([email protected]):

> Does anyone know of a good way of monitoring this?  I have experimented with 
> monitoring the output of the "whois" command, but they are quite aggressive 
> about blocking multiple connections from the same IP address.

Yes, albeit some TLDs have uninformative whois output or other problems.

In http://linuxmafia.com/pub/linux/network/, you will find both
domain-check (various numbered versions thereof) and d-check.  Both are
Perl scripts for this purpose.  To this day, every Sunday I get e-mail
via a cron job that runs domain-check against a set of about three dozen
domains (mine, friends', and those of institutions I care about) to tell
me which of them are within 90 days of expiration (and if any are past
expiration).

You'll also find a shell script called domain-check.ryan, the
ur-implementation that started all this.  (Master index for this
directory is the http://linuxmafia.com/pub/linux/network/00index.txt
file.)

In 2007, when I was contributing editor to _Linux Gazette_ (now defunct), I
wrote an article called 'Preventing Domain Expiration'[1], that talked
about the utility of running Ryan Matteson's 'domain-check' shell script
and being warned about pending expirations.  Unfortunately, Ryan's work
didn't handle important TLDs (such as .org) and presented maintenance
difficulties, so Perl coder Ben Okopnik, with some help from me, wrote 
Ben's replacement Perl implementation of domain-check, the one that is
present in many versions.

In the years since then, Ben has EOLed said code.  It has now accumulated
a few problems, solely on account of new TLDs whose whois output it
cannot parse, or changed behaviour at incumbent TLDs.  I checked with my
friend Jesse Monroy, who (FWIW) absolutely hated Ben's coding style, and
decided to write his own from-scratch Perl replacement, which is what d-check 
is.  

As I say in 00index.txt, Jesse's upstream repo is: 
https://github.com/jessemonroy650/d-check

My various template, example, and cron script files, although tuned for
Ben's domain-check, may be of use and can be found in that same
directory.

> All I want is a way of discovering when my domains will expire which doesn't 
> depend on receiving email from Melbourne IT or similar.

Done.  Yr. welcome.


[1] http://linuxmafia.com/~rick/preventing-expiration.html
Warning:  Article talks mostly about _Ryan's_ domain-check, because Ben's
was just then newly written and a bit raw.  However, please take care to
avoid Ryan's shell-script implementation of the idea, as it's a quite flawed
implementation compared to _both_ Ben's and Jesse's Perl versions.
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