CheckDNS
Online utility for DNS administrators. Test your DNS servers, domain registration, mail and web servers.

Codeflux Internet Tools Gateway
A gateway for: finger, nslookup, WHOIS, SSL, traceroute, ping, and dig.

DNS Bajaj
Check the delegation of your domain. Has interesting graphical results.

DNS Report
Provides a free DNS report on your domain name, verifying that your DNS hosting is working properly. Includes over 40 different tests, looking for both minor and major problems.

DNS Search Gateway
Handy web-based DNS lookup service, with links.

DNS Stuff
Many free web-based DNS and domain name tools all in one location. Includes standard DNS lookups, WHOIS/IPWHOIS, and even obscure DNS hosting tests, IPv6, IP-to-country and spam database lookups. Fast and thorough.

eLiteral - Web Utility
Provides ping, traceroute, whois, finger, nslookup, and dig.

Global Whois
A WHOIS domain name search. Check domain name registrations, look up domain names, IP addresses, nameservers, registrars, etc.

iWEBTOOL
iWEBTOOL has frequently used web tools. This easy to use site includes tools ranging from a rank checker to HTML encrypter.

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