/18 Subnet
Subnet Mask
255.255.192.0
Wildcard Mask
0.0.63.255
Total IPs
16,384
Usable Hosts
16,382
Network Bits
18
Host Bits
14
About /18 Networks
Medium enterprise or data center allocation. A /18 subnet uses the mask 255.255.192.0 and provides 16,382 usable host addresses out of 16,384 total IPs.
Example /18 Networks
| Network | Broadcast | First Host | Last Host |
|---|---|---|---|
| 10.0.0.0/18 | 10.0.63.255 | 10.0.0.1 | 10.0.63.254 |
| 172.16.0.0/18 | 172.16.63.255 | 172.16.0.1 | 172.16.63.254 |
| 192.168.0.0/18 | 192.168.63.255 | 192.168.0.1 | 192.168.63.254 |
| 192.168.0.0/18 | 192.168.63.255 | 192.168.0.1 | 192.168.63.254 |
| 8.8.0.0/18 | 8.8.63.255 | 8.8.0.1 | 8.8.63.254 |
Adjacent CIDRs
Frequently Asked Questions
What is a /18 subnet?
A /18 subnet uses the subnet mask 255.255.192.0 with 16,382 usable host addresses and 16,384 total IP addresses. It has 18 network bits and 14 host bits.
How many hosts in a /18 network?
A /18 network supports 16,382 usable hosts out of 16,384 total IP addresses. The usable range excludes the network address and broadcast address.
What subnet mask does /18 use?
A /18 subnet uses the mask 255.255.192.0 (wildcard mask 0.0.63.255). This means the first 18 bits identify the network and the remaining 14 bits identify hosts.