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DNS Tools

DNS Black List Provider Tools

DNS Providers Black List (DNS-bl) to check for IP addresses on the DNS black list.

Spamcop's DNS Black List to check IP address of any black listed website. Spamcop also offers a Spamcop blocking list you can install on your mailserver for a nominal fee.

Spamhaus' DNS Black List to check IP address of any black listed website. Spamhaus also offers a free Spamhaus Block List Tool that you can use on your mailserver.

DNS Diagnostic Tools

DNS Stuff
Good site that has a myriad of DNS tools available, formerly DNS Report.

DNS Report
The original site, now improved and moved DNSstuff.com.

Kloth.net
NSlookups with any query, and very powerful whois lookup tool, and other DNS tools.

Squish.net
DNS checking tools.

CheckDNS
Tool to check DNS delegation, mail, and webservers in your domain.

Sam Spade
Provides various DNS tools, and anti-spam tools.

Network-Tools.com
Provides Ping, Lookup, Trace, and xwhois.

DNS Digger
Tony Nilsson's tool to lookup records on any DNS server.

DOMTOOLS
DNS Tools by Paul Balyoz

Eye-Net Consulting
Provides various domain tools, such as looking up IP address blocks, and who owns Autonomous System Numbers.

IP-Plus
Providing general DNS tools. 

Monitoring Services Tools

Internet Traffic Report
Monitors the Internet traffic flow around the world form five continents: North America, South America, Europe, Asia, and Australia.

Internet Health Report (last hour) 
Keynote Systems Internet Health (bandwidth utilization) report for the last hour.
Includes: UUNET, C&W, QWEST, VERIO, SPRINT, LEVEL3, AT&T, and INTERNAP.

Internet Health Report (last 24 hours) 
Keynote Systems Internet Health (bandwidth utilization) report for the last 24 hours.
Includes: UUNET, C&W, QWEST, VERIO, SPRINT, LEVEL3, AT&T, and INTERNAP.

Big Brother System and Network Monitor
Big Brother monitors System and Network-delivered services for availability. Your current network status is displayed on a color-coded web page in near-real time.

Big Brother, Professional Edition
Big Brother monitors System and Network-delivered services for availability. Your current network status is displayed on a color-coded web page in near-real time. This version is for commercial users.

The Multi Router Traffic Grapher
The MRTG is a tool to monitor the traffic load on network links. MRTG generates HTML pages containing PNG images which provide LIVE visual representation of this traffic.

Netmechanic
Providing server monitoring services and more.

Rackspace
Offers three products, Guardian Angel, RackWatch, and SiteAngel.

Traceroute

TraceRoute.org
An international group of Traceroute tools from around the world.

GeekTools.com
Another international assortment of traceroute tools.

Web Server Tools

Netcraft.com
Provides info on a websites' operating system and the type of web servers it is operating, and graphs the amount of uptime.

Website Optimization Tools

Netmechanic
A diagnostic tool for finding HTML code errors, browser display problems, optimizing page loading, and more.

Dr. Watson
Dr. Watson will analyze your web page on the Internet by providing your URL. Dr. Watson will check out HTML syntax, link validity, download speeds, search engine compatibility, and link popularity.

Whois

Netsols Whois
The Registries own Whois tool at Network Solutions.

Allwhois
A provider of international whois lookups, and a directory listing ccTLD's and the respective  cc requirements.

Whois Source by Name Intelligence, Inc.
Domain Whois Search Lookup Tool. This Whois tool will also tell you at a glance if the other TLD's (.com .net .org .info .biz and .us) are registered or not.