What are some alternatives?
When comparing Ajax Domain Finder and IP Map, you can also consider the following products
Machiname - Machiname is domain name search tool that lets you enter keywords and it will look up domains availability for every combination
IP2Location - IP2Location is a leading provider of IP intelligence service.
DomainHole - DomainHole has the tools to allow you to find a great domain name.
ViewDNS.info - Free DNS related tools including Reverse IP Lookup, DNS Propagation Checker, Chinese Firewall Test...
namegrep - Domain name search with regular expressions and curated sets
DomainTools - Domain name research, including comprehensive Whois Lookup, Reverse Whois Lookup and Whois History.