This is a Nagios plugin to check the expiration date of a domain name. It uses the "whois" command, which usually comes as a "whois" package. Debian/Ubuntu: apt-get install whois Original version had this copyright notice in it: Copyright (c) 2005 Tomàs Núñez Lirola , 2009-2012 Elan Ruusamäe , under GPL License Ryan found it hosted at: http://git.pld-linux.org/gitweb.cgi/?p=packages/nagios-plugin-check_domain.git This is a modified version, hosted at https://github.com/Elyrith/check_domain Currently supports .com, .ca, .tv, .ee, .ru, .net Support for .ca and .se by Ryan Loudfoot (elyrith@gmail.com) Support for .net by Jack-Benny Persson (jack-benny@cyberinfo.se) Support for Performance Data by Ryan Loudfoot If you would like to add a TLD, send me the code or a pull request. If you want me to add one, let me know and I'll see what I can do. Change log: 2013-11-28 - Version 0.96 -Add support for .net domains thanks to Jack-Benny Persson (jack-benny@cyberinfo.se) 2013-09-06 - Version 0.92 -Modified the .com result to work for more domains since not all registrars have everything the same way -Change readme to be lower-case for the file name -Created changelog