IPv4 subnet calculator
Enter an address and a prefix length or subnet mask to see the network, broadcast, host range and binary breakdown. Then test yourself in practice mode below.
Address
You can also type CIDR notation, like 10.1.2.3/27.
Results for 172.16.45.130/26
Network bits
Host bits
| Network address | |
|---|---|
| Broadcast address | |
| First usable host | |
| Last usable host | |
| Usable hosts | |
| Total addresses | |
| Subnet mask | |
| Wildcard mask (for ACLs and OSPF) | |
| Binary address | |
| Binary mask | |
| Address class | |
| Address type |
Practice subnetting
Work out the answers on paper first, then check them. Aim to answer each question in under a minute, as you'll need to in the exam.
Score: 0 of 0 questions fully correct