Subnet calculator
Enter an IPv4 or IPv6 address with prefix or netmask: network, range and number of hosts appear immediately.
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Result
e.g. 192.168.10.25/24, 10.0.0.1 255.255.255.0 or 2001:db8::1/48
Split network
| Network | First | Last | Broadcast | Addresses |
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Frequently asked questions
Why does a /31 have two usable addresses?
Point-to-point links need neither a network nor a broadcast address (RFC 3021). Both addresses of a /31 are therefore usable; a /32 denotes exactly one address.
What is the wildcard mask?
The inverted netmask, i.e. 0.0.0.255 instead of 255.255.255.0. Access lists and OSPF on Cisco devices expect it in this form.
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