Enter an address and CIDR — get the network, broadcast, mask, host range and usable count instantly. Everything client-side.
CIDR notation (e.g. /24) sets how many bits are the network vs hosts. A /24 gives 256 addresses (254 usable); /30 gives 4 (2 usable, common for point-to-point links). Running your own server? Every KVM VPS from us gives you full root to configure networking, firewalls and routes as you like.
Straight answers.
The first 24 bits are the network; the last 8 are hosts — 256 total addresses, 254 usable (network + broadcast are reserved).
Total addresses minus 2 (network + broadcast), except /31 (2, point-to-point) and /32 (1, single host).
The inverse of the netmask — used by some routers/ACLs (e.g. Cisco). 0.0.0.255 is the wildcard for a /24.
This calculator is IPv4. IPv6 subnetting works on 128 bits and is usually delegated in /64s.
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