/17 Subnet
Subnet Mask
255.255.128.0
Wildcard Mask
0.0.127.255
Total IPs
32,768
Usable Hosts
32,766
Network Bits
17
Host Bits
15
About /17 Networks
Medium enterprise or data center allocation. A /17 subnet uses the mask 255.255.128.0 and provides 32,766 usable host addresses out of 32,768 total IPs.
Example /17 Networks
| Network | Broadcast | First Host | Last Host |
|---|---|---|---|
| 10.0.0.0/17 | 10.0.127.255 | 10.0.0.1 | 10.0.127.254 |
| 172.16.0.0/17 | 172.16.127.255 | 172.16.0.1 | 172.16.127.254 |
| 192.168.0.0/17 | 192.168.127.255 | 192.168.0.1 | 192.168.127.254 |
| 192.168.0.0/17 | 192.168.127.255 | 192.168.0.1 | 192.168.127.254 |
| 8.8.0.0/17 | 8.8.127.255 | 8.8.0.1 | 8.8.127.254 |
Adjacent CIDRs
Frequently Asked Questions
What is a /17 subnet?
A /17 subnet uses the subnet mask 255.255.128.0 with 32,766 usable host addresses and 32,768 total IP addresses. It has 17 network bits and 15 host bits.
How many hosts in a /17 network?
A /17 network supports 32,766 usable hosts out of 32,768 total IP addresses. The usable range excludes the network address and broadcast address.
What subnet mask does /17 use?
A /17 subnet uses the mask 255.255.128.0 (wildcard mask 0.0.127.255). This means the first 17 bits identify the network and the remaining 15 bits identify hosts.