Calculateur de sous-réseau
Calculer un sous-réseau IP
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Network
Split into smaller subnets
| Subnet | Usable hosts | Broadcast |
|---|
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How to calculate a subnet
- 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.
- Read the network, broadcast, host range and masks.
- To divide the network, choose the size of each smaller subnet.
Common IPv4 prefixes
| Prefix | Subnet mask | Usable hosts |
|---|---|---|
| /8 | 255.0.0.0 | 16,777,214 |
| /16 | 255.255.0.0 | 65,534 |
| /24 | 255.255.255.0 | 254 |
| /26 | 255.255.255.192 | 62 |
| /28 | 255.255.255.240 | 14 |
| /30 | 255.255.255.252 | 2 |
| /31 | 255.255.255.254 | 2 (point-to-point links) |
| /32 | 255.255.255.255 | 1 (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.
Questions fréquentes
What is a wildcard mask?
The opposite of the subnet mask (0.0.0.255 for /24). Cisco access lists and OSPF use it.
Is anything sent anywhere?
No. Everything happens in your browser, and the page is blocked from uploading anything.