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Free network tool
Subnet calculator
IPv4 network, broadcast, usable range and mask, plus block sizing for a host count. Runs entirely in your browser — no project or account is required.
Input
IPv4 address
Prefix length
192.168.1.128/26
Normalised network address for the value entered.
Private (RFC 1918)
Usable hosts62
Total addresses64
Subnet mask255.255.255.192
Wildcard0.0.0.63For ACLs and OSPF
Address range
- Network address
- 192.168.1.128
- First usable
- 192.168.1.129
- Last usable
- 192.168.1.190
- Broadcast address
- 192.168.1.191
Size a subnet
Smallest block that fits a given number of hosts.
Hosts needed
Prefix/25
Mask255.255.255.128
Usable126
Spare6