/2 Subnet Mask (192.0.0.0)
| Prefix | /2 |
|---|---|
| Subnet mask | 192.0.0.0 |
| Wildcard mask | 63.255.255.255 |
| Binary mask | 11000000.00000000.00000000.00000000 |
| Total addresses | 1,073,741,824 |
| Usable hosts | 1,073,741,822 |
| Host bits | 30 |
| Subnets of /2 in a /0 | 4 |
e.g. 10.0.0.5/22 or 10.0.0.5 255.255.252.0
| Network address | 0.0.0.0 | |
|---|---|---|
| Broadcast address | 63.255.255.255 | |
| First usable host | 0.0.0.1 | |
| Last usable host | 63.255.255.254 | |
| Total addresses | 1,073,741,824 | |
| Usable hosts | 1,073,741,822 | |
| Subnet mask | 192.0.0.0 | |
| Wildcard mask | 63.255.255.255 | |
| CIDR notation | 0.0.0.0/2 | |
| IP class | Class A (legacy) | |
| Address type | "This network" (RFC 1122) | |
| IP address (binary) | 00000000.00000000.00000000.00000000 | |
| Subnet mask (binary) | 11000000.00000000.00000000.00000000 |
■ network bits ■ host bits
| Requested hosts | CIDR | First host | Last host | Broadcast | Usable hosts |
|---|
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What is a /2 subnet?
A /2 subnet uses the first 2 bits of an IPv4 address for the network and leaves 30 bits for hosts. Its subnet mask is 192.0.0.0, and it contains 2³⁰ = 1,073,741,824 addresses, of which 1,073,741,822 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 /2 network.
A /2 covers 1/4 of the IPv4 address space (2³⁰ of 2³² addresses).
/2 subnet example
For 0.0.0.0/2: network address 0.0.0.0, usable hosts 0.0.0.1 – 63.255.255.254, broadcast address 63.255.255.255, wildcard mask 63.255.255.255.
Frequently asked questions
How many usable IPs are in a /2?
1,073,741,822. The block has 1,073,741,824 addresses; the first is the network address and the last is the broadcast address.
What is the subnet mask for /2?
192.0.0.0, or 11000000.00000000.00000000.00000000 in binary.
How many /2 subnets are in a /0?
4 (2²), because a /2 uses 2 more network bits than a /0.
What is the difference between /2 and /1?
A /1 (128.0.0.0) is twice as large: 2,147,483,648 addresses and 2,147,483,646 usable hosts, spanning two consecutive /2 blocks such as 0.0.0.0–127.255.255.255.