Changelog
What is new in SubnetKit: tools added, reference data updated, and fixes shipped, newest first.
Launch 2 July 2026
- Live subnet calculator on the home page, computing on every keystroke.
- Eight calculators: CIDR, subnet mask, wildcard mask, supernet, IPv6, IP converter, MAC formatter, and random IP.
- A page per CIDR prefix from /0 to /32, each with a live calculator and worked example.
- A port reference with a page per common TCP and UDP port, plus a port-ranges explainer.
- Free keyless JSON API for CIDR prefixes and ports, and an embeddable calculator widget.
- Plain-English guides on subnets, subnet masks, CIDR, and VLAN versus subnet.