CIDR prefix
/27
255.255.255.224
30 usable hosts · 32 addresses
The mask for /27 is 255.255.255.224 — 32 addresses, 30 usable hosts. Small office/VLAN segments.
Mask
255.255.255.224
Wildcard
0.0.0.31
Addresses
32
Hosts
30
Worked example: 192.168.0.0/27
Network address192.168.0.0/27
Broadcast address192.168.0.31
First host192.168.0.1
Last host192.168.0.30
FAQ — /27
What is the subnet mask for /27?
The subnet mask for /27 is 255.255.255.224 (wildcard: 0.0.0.31). The first 27 bits are the network part, the remaining 5 are the host part.
How many hosts fit in a /27?
A /27 block holds 32 addresses, of which 30 are usable hosts (the network and broadcast addresses are excluded).
How many /27 subnets fit in a /24?
A /24 network divides into 8 /27 subnets.
What is a /27 used for?
Small office/VLAN segments.