/3 Subnet Mask (224.0.0.0)
| Prefix | /3 |
|---|---|
| Subnet mask | 224.0.0.0 |
| Wildcard mask | 31.255.255.255 |
| Binary mask | 11100000.00000000.00000000.00000000 |
| Total addresses | 536,870,912 |
| Usable hosts | 536,870,910 |
| Host bits | 29 |
| Subnets of /3 in a /0 | 8 |
e.g. 10.0.0.5/22 or 10.0.0.5 255.255.252.0
| Network address | 0.0.0.0 | |
|---|---|---|
| Broadcast address | 31.255.255.255 | |
| First usable host | 0.0.0.1 | |
| Last usable host | 31.255.255.254 | |
| Total addresses | 536,870,912 | |
| Usable hosts | 536,870,910 | |
| Subnet mask | 224.0.0.0 | |
| Wildcard mask | 31.255.255.255 | |
| CIDR notation | 0.0.0.0/3 | |
| IP class | Class A (legacy) | |
| Address type | "This network" (RFC 1122) | |
| IP address (binary) | 00000000.00000000.00000000.00000000 | |
| Subnet mask (binary) | 11100000.00000000.00000000.00000000 |
■ 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 /3 subnet?
A /3 subnet uses the first 3 bits of an IPv4 address for the network and leaves 29 bits for hosts. Its subnet mask is 224.0.0.0, and it contains 2²⁹ = 536,870,912 addresses, of which 536,870,910 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 /3 network.
A /3 covers 1/8 of the IPv4 address space (2²⁹ of 2³² addresses).
/3 subnet example
For 0.0.0.0/3: network address 0.0.0.0, usable hosts 0.0.0.1 – 31.255.255.254, broadcast address 31.255.255.255, wildcard mask 31.255.255.255.
Frequently asked questions
How many usable IPs are in a /3?
536,870,910. The block has 536,870,912 addresses; the first is the network address and the last is the broadcast address.
What is the subnet mask for /3?
224.0.0.0, or 11100000.00000000.00000000.00000000 in binary.
How many /3 subnets are in a /0?
8 (2³), because a /3 uses 3 more network bits than a /0.
What is the difference between /3 and /2?
A /2 (192.0.0.0) is twice as large: 1,073,741,824 addresses and 1,073,741,822 usable hosts, spanning two consecutive /3 blocks such as 0.0.0.0–63.255.255.255.