/6 Subnet Mask (252.0.0.0)
| Prefix | /6 |
|---|---|
| Subnet mask | 252.0.0.0 |
| Wildcard mask | 3.255.255.255 |
| Binary mask | 11111100.00000000.00000000.00000000 |
| Total addresses | 67,108,864 |
| Usable hosts | 67,108,862 |
| Host bits | 26 |
| Subnets of /6 in a /0 | 64 |
e.g. 10.0.0.5/22 or 10.0.0.5 255.255.252.0
| Network address | 0.0.0.0 | |
|---|---|---|
| Broadcast address | 3.255.255.255 | |
| First usable host | 0.0.0.1 | |
| Last usable host | 3.255.255.254 | |
| Total addresses | 67,108,864 | |
| Usable hosts | 67,108,862 | |
| Subnet mask | 252.0.0.0 | |
| Wildcard mask | 3.255.255.255 | |
| CIDR notation | 0.0.0.0/6 | |
| IP class | Class A (legacy) | |
| Address type | "This network" (RFC 1122) | |
| IP address (binary) | 00000000.00000000.00000000.00000000 | |
| Subnet mask (binary) | 11111100.00000000.00000000.00000000 |
■ network bits ■ host bits
| Requested hosts | CIDR | First host | Last host | Broadcast | Usable hosts |
|---|
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What is a /6 subnet?
A /6 subnet uses the first 6 bits of an IPv4 address for the network and leaves 26 bits for hosts. Its subnet mask is 252.0.0.0, and it contains 2²⁶ = 67,108,864 addresses, of which 67,108,862 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 /6 network.
A /6 covers 1/64 of the IPv4 address space (2²⁶ of 2³² addresses).
/6 subnet example
For 0.0.0.0/6: network address 0.0.0.0, usable hosts 0.0.0.1 – 3.255.255.254, broadcast address 3.255.255.255, wildcard mask 3.255.255.255.
Frequently asked questions
How many usable IPs are in a /6?
67,108,862. The block has 67,108,864 addresses; the first is the network address and the last is the broadcast address.
What is the subnet mask for /6?
252.0.0.0, or 11111100.00000000.00000000.00000000 in binary.
How many /6 subnets are in a /0?
64 (2⁶), because a /6 uses 6 more network bits than a /0.
What is the difference between /6 and /5?
A /5 (248.0.0.0) is twice as large: 134,217,728 addresses and 134,217,726 usable hosts, spanning two consecutive /6 blocks such as 0.0.0.0–7.255.255.255.