/27 Subnet Mask (255.255.255.224)
| Prefix | /27 |
|---|---|
| Subnet mask | 255.255.255.224 |
| Wildcard mask | 0.0.0.31 |
| Binary mask | 11111111.11111111.11111111.11100000 |
| Total addresses | 32 |
| Usable hosts | 30 |
| Host bits | 5 |
| Subnets of /27 in a /24 | 8 |
| Block size | 32 addresses (subnets start every 32 in the last octet) |
e.g. 10.0.0.5/22 or 10.0.0.5 255.255.252.0
| Network address | 192.168.1.0 | |
|---|---|---|
| Broadcast address | 192.168.1.31 | |
| First usable host | 192.168.1.1 | |
| Last usable host | 192.168.1.30 | |
| Total addresses | 32 | |
| Usable hosts | 30 | |
| Subnet mask | 255.255.255.224 | |
| Wildcard mask | 0.0.0.31 | |
| CIDR notation | 192.168.1.0/27 | |
| IP class | Class C (legacy) | |
| Address type | Private (RFC 1918) | |
| IP address (binary) | 11000000.10101000.00000001.00000000 | |
| Subnet mask (binary) | 11111111.11111111.11111111.11100000 |
■ network bits ■ host bits
| Requested hosts | CIDR | First host | Last host | Broadcast | Usable hosts |
|---|
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What is a /27 subnet?
A /27 subnet uses the first 27 bits of an IPv4 address for the network and leaves 5 bits for hosts. Its subnet mask is 255.255.255.224, and it contains 2⁵ = 32 addresses, of which 30 can be assigned to devices. Typical use: Small segments: DMZs, management networks, printer or camera VLANs. Use the subnet calculator above to check any /27 network.
/27 subnet example
For 192.168.1.0/27: network address 192.168.1.0, usable hosts 192.168.1.1 – 192.168.1.30, broadcast address 192.168.1.31, wildcard mask 0.0.0.31.
/27 networks in 192.168.1.0/24
A /24 holds 8 /27 networks:
- 192.168.1.0/27
- 192.168.1.32/27
- 192.168.1.64/27
- 192.168.1.96/27
- 192.168.1.128/27
- 192.168.1.160/27
- 192.168.1.192/27
- 192.168.1.224/27
Frequently asked questions
How many usable IPs are in a /27?
30. The block has 32 addresses; the first is the network address and the last is the broadcast address.
What is the subnet mask for /27?
255.255.255.224, or 11111111.11111111.11111111.11100000 in binary.
How many /27 subnets are in a /24?
8 (2³), because a /27 uses 3 more network bits than a /24.
What is the difference between /27 and /26?
A /26 (255.255.255.192) is twice as large: 64 addresses and 62 usable hosts, spanning two consecutive /27 blocks such as 192.168.1.0–192.168.1.63.