Whois Index - Whois Lookup Tool
whocalled.us
Mobile To Mobile Lookup Tool - AT&T, formerly Cingular Wireless
Reverse Lookup on AnyWho
CoolWhois.com - the WHOIS that lets you search any domain!
Discover Who Hosts Any Website | Who Is Hosting This
Subdomains and websites networks on Wholinks.org
US Short Codes – your source for Mobile Marketing
US Common Short Codes Who Is Directory - Home
ID from User - Find your twitter ID
URL Linter - Facebook Developers
URL Linter - Facebook Developers
Convert Host Name to IP Address or Find IP address of a host - e.g. find IP address of host name of
Free Mobile Phone Number Carrier Lookup
TelcoData.US: Search by Area Code / Exchange
One API 4 SMS - API to Send SMS and Receive SMS by Long Code and Short Code
Hashtags
Reverse IP Lookup - Find Other Web Sites Hosted on a Web Server
Introducing the Beta Launch of the New ICANN WHOIS Lookup Tool
Howto find all websites running on a given IP address | Robert Penz Blog
What WordPress Theme Is That?
WHOIS Search, Domain Name, Website, and IP Tools - Who.is
Mobile Tools
Google Public DNS
ViewDNS.info - Your one source for DNS related tools!
DNS Lookup - MxToolbox
Mail Settings Lookup - Apple Support
Discover Who Hosts Any Website | Who Is Hosting This
Who Is Hosting This Site? Free Tool
Why INDEX-MATCH Is Far Better Than VLOOKUP or HLOOKUP in Excel