Simple DNS+Traceroute Library. - Object for simple IP address and host name resolution, as well as host trace route. By PSTRUH Software. [Component, Free] - http://www.motobit.com/help/tcpip/
IntraDNS - Can resolve host name, IP lookup, MX lookup and reverse IP lookup. [Component, Commercial] - http://www.softwaremodules.com/IntraDNS.php
DigiDomain ASP Whois - An ASP integrated domain lookup, name spinner and whois tool. [Component, Commercial] - http://www.digiappz.com/digidomain.asp?id=3
etiveWHOIS - Retrieves the domain name registrant information and determine domain name availability from a WHOIS server. By etive.com. [Component, Commercial] - http://www.etive.com/software/etivewhois/
etiveDNS - Perform DNS lookups, reverse lookups, get local ip and host name, check ip address validity, ping and trace another host. By etive.com. [Component, Commercial] - http://www.etive.com/software/etivedns/