It's network stuff. Get Whois results against an IP or domain name.
Find owner records of any internet connected system.
Whois is a network protocol that provides the ability to find the registration record for an IP address or domain name. An important use of the
whois protocol is to enable the tracking and reporting of abusive systems. Whether it is spam, denial of service or network based attacks originating from an IP address, using whois a system administrator is able to discover who owns that IP address and report it to the web host provider or ISP (internet service provider).
whois command comes installed in many Linux based distributions such as Ubuntu and Fedora. When installed it is a simple matter of running the command followed by an IP address or hostname to get the results of the registration lookup.
There is a Windows whois client that can be downloaded as part of the
sysinternals suite of windows tools. Grab a copy from the Microsoft Technet site.
Here is the whois command line options for the Ubuntu install of whois.
Usage: whois [OPTION]... OBJECT... -l one level less specific lookup [RPSL only] -L find all Less specific matches -m find first level more specific matches -M find all More specific matches -c find the smallest match containing a mnt-irt attribute -x exact match [RPSL only] -d return DNS reverse delegation objects too [RPSL only] -i ATTR[,ATTR]... do an inverse lookup for specified ATTRibutes -T TYPE[,TYPE]... only look for objects of TYPE -K only primary keys are returned [RPSL only] -r turn off recursive lookups for contact information -R force to show local copy of the domain object even if it contains referral -a search all databases -s SOURCE[,SOURCE]... search the database from SOURCE -g SOURCE:FIRST-LAST find updates from SOURCE from serial FIRST to LAST -t TYPE request template for object of TYPE -v TYPE request verbose template for object of TYPE -q [version|sources|types] query specified server info [RPSL only] -F fast raw output (implies -r) -h HOST connect to server HOST -p PORT connect to PORT -H hide legal disclaimers --verbose explain what is being done --help display this help and exit --version output version information and exit