/16 Subnet
Subnet Mask
255.255.0.0
Wildcard Mask
0.0.255.255
Total IPs
65,536
Usable Hosts
65,534
Network Bits
16
Host Bits
16
About /16 Networks
Class B equivalent — campus or large organizational network (65K addresses). A /16 subnet uses the mask 255.255.0.0 and provides 65,534 usable host addresses out of 65,536 total IPs.
Example /16 Networks
| Network | Broadcast | First Host | Last Host |
|---|---|---|---|
| 10.0.0.0/16 | 10.0.255.255 | 10.0.0.1 | 10.0.255.254 |
| 172.16.0.0/16 | 172.16.255.255 | 172.16.0.1 | 172.16.255.254 |
| 192.168.0.0/16 | 192.168.255.255 | 192.168.0.1 | 192.168.255.254 |
| 192.168.0.0/16 | 192.168.255.255 | 192.168.0.1 | 192.168.255.254 |
| 8.8.0.0/16 | 8.8.255.255 | 8.8.0.1 | 8.8.255.254 |
Adjacent CIDRs
Frequently Asked Questions
What is a /16 subnet?
A /16 subnet uses the subnet mask 255.255.0.0 with 65,534 usable host addresses and 65,536 total IP addresses. It has 16 network bits and 16 host bits.
How many hosts in a /16 network?
A /16 network supports 65,534 usable hosts out of 65,536 total IP addresses. The usable range excludes the network address and broadcast address.
What subnet mask does /16 use?
A /16 subnet uses the mask 255.255.0.0 (wildcard mask 0.0.255.255). This means the first 16 bits identify the network and the remaining 16 bits identify hosts.