Network tools
IPv4 and IPv6 subnetting, classification, planning, and reference — computed exactly from parsed values, never from a lookup service. Nothing leaves your tab.
- IPv4 subnet calculator
Network, broadcast, mask, wildcard, host counts — exact BigInt math on your CIDR.
- IPv6 expand & compress
Expand, compress, and canonicalize IPv6 — RFC 5952 rules applied and named.
- IPv6 prefix calculator
First and last address, exact 2^n capacity, arpa prefix — for any /0–/128.
- IP range classifier
Private, reserved, or special-purpose — checked against a dated IANA registry snapshot.
- IP number forms
IPv4/IPv6 as integer, hex, and binary — exact both directions.
- VLSM planner
Allocate unequal subnets from one base — every sizing decision visible as a step.
- Subnet split & aggregate
Split a block into equal children, or merge siblings back — preconditions refused honestly.
- MAC & EUI-64
Every MAC notation, the U/L and group bits named, the EUI-64 and its fe80:: derivation.
- Port reference
A dated, curated IANA port snapshot — search numbers, names, and protocols.
- Bandwidth calculator
Transfer time at a line rate — exact fractions, both unit bases, no fake efficiency.
10 tools · everything is computed locally, nothing leaves your device.