The Tools screens provides a variety of helpful utility functions such as a Calculator, Stopwatch, Count down timer, approximate Bandwidth conversion, numeric base converter, DNS and WhoIs lookup.
The CountDown Timer drop-down box allows storing of multiple events for later reference.
The DNS Lookup function provides DNS name to IP address(es) and an IP address to name capabilities. The WhoIs Lookup
The IP Workshop Professional TCP/IP Subnet calculator is provided courtesy of Peter Kostov and Peko Software. This tool supports a wide range of IPv4 address operations such as converting the classical subnet format into a CIDR, split up a Class B network into different sized subnets and obtain a quick summarization of subnets.