Networking
Networking tools for IP, subnet, and cabling work in homelabs and small networks.
Dual-Stack CIDR Calculator
Dual-stack CIDR calculator: work out IPv4 masks and IPv6 prefixes on one page, with network ranges, host counts, and copy-ready CIDR.
IPv4 CIDR Calculator
Convert an IPv4 address and prefix or subnet mask into network, broadcast, usable hosts, and wildcard — then copy the CIDR.
IPv6 CIDR Calculator
Expand or compress an IPv6 address, apply a prefix length, and see the network range, address count, and ip6.arpa PTR.
RJ45 Pinout
T568A vs T568B color order, straight-through vs crossover, and a copy-ready wire sequence for RJ45 ethernet cables.