CIDR / Subnet Calculator
Calculate network address, broadcast, host range, and subnet mask from CIDR notation.
/8 — 16,777,216 hosts (Class A)
/16 — 65,536 hosts (Class B)
/24 — 256 hosts (Class C)
/28 — 16 hosts
/30 — 4 hosts (point-to-point)
/32 — 1 host (single IP)
curl "swissarmydev.tools/cidr?cidr=192.168.1.0/24"