IPv4 & IPv6 subnet calculator, DNS lookup, ping, traceroute, and VLSM designer — all in one fast, native app. Live results as you type, synced across your devices.
Free · Right in your browser
IPv4 & IPv6 subnetting, VLSM planning, and mask conversion — instant results, no download or signup required.
Features
Network and broadcast addresses, usable host ranges, masks, wildcard, and host counts — calculated live as you type any CIDR.
Resolve A, AAAA, MX, TXT, and more records for any hostname, right from your device with one tap.
Measure ICMP round-trip time and packet loss, and trace the full network path hop-by-hop to any host.
Carve a network into right-sized subnets with variable-length masks — plan addressing without spreadsheets.
Convert CIDR ↔ mask ↔ wildcard, summarize many networks into one, turn IP ranges into minimal CIDR blocks, and check subnet membership.
Build a library of your most-used subnets, plans, and lookups, with full history — synced privately across all your devices.
A closer look
One download, every Apple platform. Subnet Plus is optimized for each screen size — including a multi-column layout on iPad — and your saved work follows you everywhere via iCloud.
Localization
Free to download — the network toolkit engineers have trusted since 2013.
