traceroute.org is a large collection of traceroute, looking glass, route servers and bgp links

Open source cross-platform visual traceroute, network packet sniffer and whois tool.

Open source cross-platform visual traceroute, network packet sniffer and whois tool.

trace straighter

Easy to use web-based service.

Webmaster tools for ping, traceroute, whois, and pagerank

NetStat Agent provides a fast and easy way to establish what ports and connections are available from your client computer. NetStat Agent has a state-of-the-art and comprehensive toolkit including: netstat, ping, traceroute, ipconfig, dns query, whois, ARP, HTTP checker, shows TCP/IP statistics, DNS cache, all MAC addresses, IP routes and much more!

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DNS Frog provides several IP and DNS tools like Reverse DNS, IP Localization, Ping, Whois, traceroute, MX and NS queries.

DNSgoodies com Free utilities for DNS check Open relay tests Spam lookups Whois and other domain related information