Anti-Spam Blacklist Thing lets you check to see if a given IP address or hostname is on one of up to 20 different anti-spam blacklists. Anti-Spam Blacklist Thing is provided by SpamButcher completely free of charge.

PackPal Ping Utility is a handy and powerful ping program for system administrator or webmaster to check network connection, intended to replace the standard ping program.

Capturix NETWorks is a network utility software that ables you to test and diagnose all common problems from any network.

Pingotron is made for network administrators, webmasters, and Internet service providers.

NetInfo is a collection of 15 different state-of-the-art network tools on a single, easy-to-use interface that allows you to isolate faults, simplify processing of diagnostic data, and increase internal network security.

Free IP scanner is a very fast IP scanner and port scanner. Powered with multi-thread scan technology, it can scan hundreds computers per second. It simply pings each IP address, gets hostname, MAC address, NetBIOS information, scans ports, etc.

VisualRoute Lite Edition analyzes your Internet connection and identifies where problems occur, determining if slow performance is due to your ISP or a problem on the Internet.

Free Port Scanner is a small and fast port scanner for the Win32 platform. You can scan ports on fast machines in a few seconds and can perform scan on predefined port ranges.The tool is designed with a user-friendly interface and is easy to use.

VisualRoute combines several essential network tools to analyze Internet connections and identify bottlenecks that cause slow response. The path of each connection is shown on a world map, domain and network Whois lookups enable quick reporting.

DNS Thing is a free tool that lets Windows users perform DNS queries from a graphical interface. It provides commonly looked up information such as IP addresses for hostnames or MX records for domains.