/8 Subnet Mask (255.0.0.0)
| Prefix | /8 |
|---|---|
| Subnet mask | 255.0.0.0 |
| Wildcard mask | 0.255.255.255 |
| Binary mask | 11111111.00000000.00000000.00000000 |
| Total addresses | 16,777,216 |
| Usable hosts | 16,777,214 |
| Host bits | 24 |
| Subnets of /8 in a /0 | 256 |
e.g. 10.0.0.5/22 or 10.0.0.5 255.255.252.0
| Network address | 10.0.0.0 | |
|---|---|---|
| Broadcast address | 10.255.255.255 | |
| First usable host | 10.0.0.1 | |
| Last usable host | 10.255.255.254 | |
| Total addresses | 16,777,216 | |
| Usable hosts | 16,777,214 | |
| Subnet mask | 255.0.0.0 | |
| Wildcard mask | 0.255.255.255 | |
| CIDR notation | 10.0.0.0/8 | |
| IP class | Class A (legacy) | |
| Address type | Private (RFC 1918) | |
| IP address (binary) | 00001010.00000000.00000000.00000000 | |
| Subnet mask (binary) | 11111111.00000000.00000000.00000000 |
■ network bits ■ host bits
| Requested hosts | CIDR | First host | Last host | Broadcast | Usable hosts |
|---|
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What is a /8 subnet?
A /8 subnet uses the first 8 bits of an IPv4 address for the network and leaves 24 bits for hosts. Its subnet mask is 255.0.0.0, and it contains 2²⁴ = 16,777,216 addresses, of which 16,777,214 can be assigned to devices. Typical use: Former Class A size; 10.0.0.0/8 is the largest private range and 127.0.0.0/8 is loopback. Use the subnet calculator above to check any /8 network.
/8 subnet example
For 10.0.0.0/8: network address 10.0.0.0, usable hosts 10.0.0.1 – 10.255.255.254, broadcast address 10.255.255.255, wildcard mask 0.255.255.255.
Frequently asked questions
How many usable IPs are in a /8?
16,777,214. The block has 16,777,216 addresses; the first is the network address and the last is the broadcast address.
What is the subnet mask for /8?
255.0.0.0, or 11111111.00000000.00000000.00000000 in binary.
How many /8 subnets are in a /0?
256 (2⁸), because a /8 uses 8 more network bits than a /0.
What is the difference between /8 and /7?
A /7 (254.0.0.0) is twice as large: 33,554,432 addresses and 33,554,430 usable hosts, spanning two consecutive /8 blocks such as 10.0.0.0–11.255.255.255.