/7 Subnet Mask (254.0.0.0)
| Prefix | /7 |
|---|---|
| Subnet mask | 254.0.0.0 |
| Wildcard mask | 1.255.255.255 |
| Binary mask | 11111110.00000000.00000000.00000000 |
| Total addresses | 33,554,432 |
| Usable hosts | 33,554,430 |
| Host bits | 25 |
| Subnets of /7 in a /0 | 128 |
e.g. 10.0.0.5/22 or 10.0.0.5 255.255.252.0
| Network address | 0.0.0.0 | |
|---|---|---|
| Broadcast address | 1.255.255.255 | |
| First usable host | 0.0.0.1 | |
| Last usable host | 1.255.255.254 | |
| Total addresses | 33,554,432 | |
| Usable hosts | 33,554,430 | |
| Subnet mask | 254.0.0.0 | |
| Wildcard mask | 1.255.255.255 | |
| CIDR notation | 0.0.0.0/7 | |
| IP class | Class A (legacy) | |
| Address type | "This network" (RFC 1122) | |
| IP address (binary) | 00000000.00000000.00000000.00000000 | |
| Subnet mask (binary) | 11111110.00000000.00000000.00000000 |
■ network bits ■ host bits
| Requested hosts | CIDR | First host | Last host | Broadcast | Usable hosts |
|---|
Runs entirely in your browser. Nothing you enter is sent to a server.
What is a /7 subnet?
A /7 subnet uses the first 7 bits of an IPv4 address for the network and leaves 25 bits for hosts. Its subnet mask is 254.0.0.0, and it contains 2²⁵ = 33,554,432 addresses, of which 33,554,430 can be assigned to devices. Typical use: Very large blocks only seen in routing tables and IANA allocations; /4 is the multicast range 224.0.0.0/4. Use the subnet calculator above to check any /7 network.
A /7 covers 1/128 of the IPv4 address space (2²⁵ of 2³² addresses).
/7 subnet example
For 0.0.0.0/7: network address 0.0.0.0, usable hosts 0.0.0.1 – 1.255.255.254, broadcast address 1.255.255.255, wildcard mask 1.255.255.255.
Frequently asked questions
How many usable IPs are in a /7?
33,554,430. The block has 33,554,432 addresses; the first is the network address and the last is the broadcast address.
What is the subnet mask for /7?
254.0.0.0, or 11111110.00000000.00000000.00000000 in binary.
How many /7 subnets are in a /0?
128 (2⁷), because a /7 uses 7 more network bits than a /0.
What is the difference between /7 and /6?
A /6 (252.0.0.0) is twice as large: 67,108,864 addresses and 67,108,862 usable hosts, spanning two consecutive /7 blocks such as 0.0.0.0–3.255.255.255.