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Subnetz-Rechner

Ein IP-Subnetz berechnen

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Network

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How to calculate a subnet

  1. Enter an address and prefix, like 192.168.1.10/24, or an address and mask, like 10.0.0.1 255.255.0.0.
  2. Read the network, broadcast, host range and masks.
  3. To divide the network, choose the size of each smaller subnet.

Common IPv4 prefixes

PrefixSubnet maskUsable hosts
/8255.0.0.016,777,214
/16255.255.0.065,534
/24255.255.255.0254
/26255.255.255.19262
/28255.255.255.24014
/30255.255.255.2522
/31255.255.255.2542 (point-to-point links)
/32255.255.255.2551 (a single address)

Good to know

  • Two addresses of every IPv4 subnet are reserved: the network address and the broadcast address. /31 and /32 are the exceptions.
  • Private ranges (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16) are recognised, along with loopback, link-local and carrier-grade NAT.
  • IPv6 addresses are shown in their shortest standard form (RFC 5952) and in full.

Häufige Fragen

What is a wildcard mask?

The opposite of the subnet mask (0.0.0.255 for /24). Cisco access lists and OSPF use it.

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