IPNetInfo v1.10

IPNetInfo is a small utility that allows you to easily find all available information about an IP address: The owner of the IP address, the country/state name, IP addresses range, contact information (address, phone, fax, and email), and more.
Download IPNetInfo (in ZIP file) Download self-install executable for installing IPNetInfo with uninstall support

WhoisThisDomain v1.20
This utility allows you to easily get information about a registered domain. It automatically connect to the right WHOIS server, according to the top-level domain name, and retrieve the WHOIS record of the domain.
It support both generic domains and country code domains.
Download WhoisThisDomain (in ZIP file) Download self-install executable for installing WhoisThisDomain with uninstall support

Many more great freeware applications from NirSoft:
http://www.nirsoft.net/