Codeflux Internet Tools Gateway
- A gateway for: finger, nslookup, WHOIS, SSL, traceroute, ping, and dig.
- http://codeflux.com/exec/tools/

Sitegizmos Webmaster Tools
- Sitegizmos provides some DNS tools, as well as some other tools useful to webmasters.
- http://www.sitegizmos.com

Global Whois
- A WHOIS domain name search. Check domain name registrations, look up domain names, IP addresses, nameservers, registrars, etc.
- http://www.ratite.com/whois/

iWEBTOOL
- iWEBTOOL has frequently used web tools. This easy to use site includes tools ranging from a rank checker to HTML encrypter.
- http://www.iwebtool.com

Name Server Zone Transfer Tool
- Free tool to check the security of any name server. Requests a name server zone transfer for any domain.
- http://www.digitalpoint.com/tools/zone-transfer/

Lookup Server
- Provides basic forward and reverse DNS lookups, as well as MX record and server software lookups.
- http://www.lookupserver.com

eLiteral - Web Utility
- Provides ping, traceroute, whois, finger, nslookup, and dig.
- http://www.eliteral.com/moveditems/webutil/

DNS Bajaj
- Check the delegation of your domain. Has interesting graphical results.
- http://www.zonecut.net/dns/

Kloth.net NSlookup
- Web-based nslookup tool that lets you look up IP address information. Query their and other DNS domain name servers to look up and find IP address information of computers on the internet.
- http://www.kloth.net/services/nslookup.php

Web-Based NSlookup page
- You can query any domain here to find the DNS information similar to a nslookup. Links to whois information.
- http://www.enc.com.au/itools/nslookup.php

CheckDNS
- Online utility for DNS administrators. Test your DNS servers, domain registration, mail and web servers.
- http://www.checkdns.net

squish.net DNS Checker
- Complete DNS traversal check. Shows you every DNS server that is (or may be) used for a DNS lookup, very comprehensive.
- http://www.squish.net/dnscheck/

DNS Search Gateway
- Handy web-based DNS lookup service, with links.
- http://cgibin.erols.com/ziring/cgi-bin/nsgate/gate.pl

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.
- http://www.dnsstuff.com/

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.
- http://www.dnsreport.com/

AnalogX: DNSDig
- DNSDig is a web version of dig. Allows you to query for a domain's DNS from any machine on the internet. Has very comprehensive results.
- http://www.analogx.com/contents/dnsdig.htm