/8 Subnet
Subnet Mask
255.0.0.0
Wildcard Mask
0.255.255.255
Total IPs
16,777,216
Usable Hosts
16,777,214
Network Bits
8
Host Bits
24
About /8 Networks
Class A equivalent — large enterprise or ISP allocation (16.7M addresses). A /8 subnet uses the mask 255.0.0.0 and provides 16,777,214 usable host addresses out of 16,777,216 total IPs.
Example /8 Networks
| Network | Broadcast | First Host | Last Host |
|---|---|---|---|
| 10.0.0.0/8 | 10.255.255.255 | 10.0.0.1 | 10.255.255.254 |
| 172.0.0.0/8 | 172.255.255.255 | 172.0.0.1 | 172.255.255.254 |
| 192.0.0.0/8 | 192.255.255.255 | 192.0.0.1 | 192.255.255.254 |
| 192.0.0.0/8 | 192.255.255.255 | 192.0.0.1 | 192.255.255.254 |
| 8.0.0.0/8 | 8.255.255.255 | 8.0.0.1 | 8.255.255.254 |
Adjacent CIDRs
Frequently Asked Questions
What is a /8 subnet?
A /8 subnet uses the subnet mask 255.0.0.0 with 16,777,214 usable host addresses and 16,777,216 total IP addresses. It has 8 network bits and 24 host bits.
How many hosts in a /8 network?
A /8 network supports 16,777,214 usable hosts out of 16,777,216 total IP addresses. The usable range excludes the network address and broadcast address.
What subnet mask does /8 use?
A /8 subnet uses the mask 255.0.0.0 (wildcard mask 0.255.255.255). This means the first 8 bits identify the network and the remaining 24 bits identify hosts.