domain_info.pl is a perl script that shows key WHOIS and DNS information
about a given domain name.

This utility requires Net::DNS, which you can easily install via:
cpan Net::DNS

It takes as input a domain name (i.e. example.com) and returns a nicely
formatted report of public infromation about the domain: condensed/important
WHOIS information, along with DNS information (specifically, the 'A' records 
or 'CNAME' records for the domain, the www subdomain, and whatever subdomain
you optionally specify).

Examples:
domain_info.pl example.com
domain_info.pl store.example.com

Both of these examples will show the condensed whois information for
'example.com', along with the following DNS records:

A or CNAME record for example.com
A or CNAME record for www.example.com
MX records for example.com

The store.example.com version will also show the 'A' or 'CNAME' record for
'store.example.com'.

It also performs a reverse-WHOIS on the returned IP addresses, which will
show you the listed owner of the IP address(es).

The WHOIS fields which are displayed:
* current registrar
* expiration date
* any 'status' fields
* any nameserver records

If the WHOIS information is returned in a way that confuses the script,
the full output of a 'whois' command is displayed instead of the condensed
version.

Full output looks like this:

$ ./domain_info.pl github.com

github.com

*** Condensed WHOIS information ***
Registrar: GODADDY.COM, INC.
Expires: 09-oct-2018
Status: clientDeleteProhibited
Status: clientRenewProhibited
Status: clientTransferProhibited
Status: clientUpdateProhibited
Name servers:
    NS1.P16.DYNECT.NET
    NS2.P16.DYNECT.NET
    NS3.P16.DYNECT.NET
    NS4.P16.DYNECT.NET


*** DNS information ***
Web:
      github.com: [A] 207.97.227.239 (Rackspace Hosting)
  www.github.com: [A] 207.97.227.243 (Rackspace Hosting)

Email: 
  10:   ALT2.ASPMX.L.GOOGLE.com: [A] 74.125.93.26 (Google Inc.)
  10:        ASPMX.L.GOOGLE.com: [A] 74.125.127.26 (Google Inc.)
  10:     ASPMX2.GOOGLEMAIL.com: [A] 74.125.43.27 (Google Inc.)
  10:     ASPMX3.GOOGLEMAIL.com: [A] 74.125.127.27 (Google Inc.)
  10:   ALT1.ASPMX.L.GOOGLE.com: [A] 74.125.159.27 (Google Inc.)