/5 Subnet Mask (248.0.0.0)
| Prefix | /5 |
|---|---|
| Subnet mask | 248.0.0.0 |
| Wildcard mask | 7.255.255.255 |
| Binary mask | 11111000.00000000.00000000.00000000 |
| Total addresses | 134,217,728 |
| Usable hosts | 134,217,726 |
| Host bits | 27 |
| Subnets of /5 in a /0 | 32 |
e.g. 10.0.0.5/22 or 10.0.0.5 255.255.252.0
| Network address | 0.0.0.0 | |
|---|---|---|
| Broadcast address | 7.255.255.255 | |
| First usable host | 0.0.0.1 | |
| Last usable host | 7.255.255.254 | |
| Total addresses | 134,217,728 | |
| Usable hosts | 134,217,726 | |
| Subnet mask | 248.0.0.0 | |
| Wildcard mask | 7.255.255.255 | |
| CIDR notation | 0.0.0.0/5 | |
| IP class | Class A (legacy) | |
| Address type | "This network" (RFC 1122) | |
| IP address (binary) | 00000000.00000000.00000000.00000000 | |
| Subnet mask (binary) | 11111000.00000000.00000000.00000000 |
■ network bits ■ host bits
| Requested hosts | CIDR | First host | Last host | Broadcast | Usable hosts |
|---|
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What is a /5 subnet?
A /5 subnet uses the first 5 bits of an IPv4 address for the network and leaves 27 bits for hosts. Its subnet mask is 248.0.0.0, and it contains 2²⁷ = 134,217,728 addresses, of which 134,217,726 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 /5 network.
A /5 covers 1/32 of the IPv4 address space (2²⁷ of 2³² addresses).
/5 subnet example
For 0.0.0.0/5: network address 0.0.0.0, usable hosts 0.0.0.1 – 7.255.255.254, broadcast address 7.255.255.255, wildcard mask 7.255.255.255.
Frequently asked questions
How many usable IPs are in a /5?
134,217,726. The block has 134,217,728 addresses; the first is the network address and the last is the broadcast address.
What is the subnet mask for /5?
248.0.0.0, or 11111000.00000000.00000000.00000000 in binary.
How many /5 subnets are in a /0?
32 (2⁵), because a /5 uses 5 more network bits than a /0.
What is the difference between /5 and /4?
A /4 (240.0.0.0) is twice as large: 268,435,456 addresses and 268,435,454 usable hosts, spanning two consecutive /5 blocks such as 0.0.0.0–15.255.255.255.