General

• Computer Size Converter - convert easily between bytes, kilobytes, megabytes, terabytes, petabytes, etc. This tool also provides the number of 8-bit (octets), 16-bit (hextets), 32-bit, 64-bit, and 128-bit groupings which may be useful in situations where needing to know this is needed.
• Timestamp Converter and Parser - convert easily between different types of timestamps in use by various different computer systems today. It accepts natural input like 1999-01-01 00:03:33 so you can easily convert between timestamps without having to have any (for example if you only have log files that have human readable dates and times).
• Base 2, 8, 10, 16, and 36 Converter - quickly convert between numbers of various bases and learn about the different numbering systems used in computing. Multiple different bases are shown on one page with quick links to some common numbers.
• IPv4 Subnet Calculator - enter in an IP address or an IP network in CIDR notation and find out the range of IPs that are in the range, the reverse DNSes of the beginnings and ends, and which RIR or organization operates a network quickly and easily all from your browser. Lots of different stats, along with popular IP networks, are also given as suggestions.

Unix