IPv4 Subnet Calculator
Compute network, broadcast, mask and usable hosts for any IPv4 subnet.
Subnet Calculator
An essential tool for network administrators and students. Get all the key facts about an IPv4 subnet at a glance.
FAQ — Subnet Calculator
What is CIDR?
Classless Inter-Domain Routing notation — a number from 0 to 32 representing how many bits make up the network portion.