Calcolatore subnet

Scegli una rete e una nuova lunghezza del prefisso per dividerla in subnet uguali.

Rete

Dividi in

4 subnet /24

#	Indirizzo di rete	Intervallo utilizzabile	Indirizzo di broadcast	Host utilizzabili
1	10.0.0.0/24	10.0.0.1 – 10.0.0.254	10.0.0.255	254
2	10.0.1.0/24	10.0.1.1 – 10.0.1.254	10.0.1.255	254
3	10.0.2.0/24	10.0.2.1 – 10.0.2.254	10.0.2.255	254
4	10.0.3.0/24	10.0.3.1 – 10.0.3.254	10.0.3.255	254

Questo testo non è ancora disponibile in italiano. Viene mostrato in inglese finché non sarà pubblicata una traduzione.

Subnetting divides one network into smaller, equally sized networks by lengthening the prefix. Every extra bit doubles the number of subnets and halves their size: a /24 split into /26 gives four networks of 64 addresses each.

Pick a network and the new prefix length. The table lists each resulting subnet with its usable range — useful for planning VLANs, cloud VPC subnets or IPv6 site allocations. For IPv6, the common unit for a single LAN is a /64; sites typically receive a /48 or /56.

Domande frequenti

How do I split a /24 into four subnets?

Use /26. Adding two bits to the prefix (24 + 2) creates 2² = 4 subnets of 64 addresses: .0/26, .64/26, .128/26 and .192/26.

Why should IPv6 LANs use /64?

SLAAC address autoconfiguration and many IPv6 features assume a 64-bit interface identifier, so subnets smaller than /64 break standard behaviour.

Can subnets be different sizes?

Yes — that is variable-length subnet masking (VLSM). Calculate each block separately and make sure the ranges don't overlap.

Domande frequenti

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