/23 Subnet
Subnet Mask
255.255.254.0
Wildcard Mask
0.0.1.255
Total IPs
512
Usable Hosts
510
Network Bits
23
Host Bits
9
About /23 Networks
Small-medium subnet — single floor or department (510 hosts). A /23 subnet uses the mask 255.255.254.0 and provides 510 usable host addresses out of 512 total IPs.
Example /23 Networks
| Network | Broadcast | First Host | Last Host |
|---|---|---|---|
| 10.0.0.0/23 | 10.0.1.255 | 10.0.0.1 | 10.0.1.254 |
| 172.16.0.0/23 | 172.16.1.255 | 172.16.0.1 | 172.16.1.254 |
| 192.168.0.0/23 | 192.168.1.255 | 192.168.0.1 | 192.168.1.254 |
| 192.168.0.0/23 | 192.168.1.255 | 192.168.0.1 | 192.168.1.254 |
| 8.8.8.0/23 | 8.8.9.255 | 8.8.8.1 | 8.8.9.254 |
Adjacent CIDRs
Frequently Asked Questions
What is a /23 subnet?
A /23 subnet uses the subnet mask 255.255.254.0 with 510 usable host addresses and 512 total IP addresses. It has 23 network bits and 9 host bits.
How many hosts in a /23 network?
A /23 network supports 510 usable hosts out of 512 total IP addresses. The usable range excludes the network address and broadcast address.
What subnet mask does /23 use?
A /23 subnet uses the mask 255.255.254.0 (wildcard mask 0.0.1.255). This means the first 23 bits identify the network and the remaining 9 bits identify hosts.