/27 Subnet

A /27 has 32 addresses, 30 of them usable by hosts. Its netmask is 255.255.255.224. Enter any address below to see its /27 network.

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IP Address / Prefix

Examples:

IPv4 network

30 usable hosts · 192.168.1.1 to 192.168.1.30

Private (RFC 1918)

Details

Netmask

Wildcard Mask

Broadcast

First Usable

Last Usable

Usable Hosts

Total Addresses

Netmask in Binary

Split Into Subnets

192.168.1.0/28192.168.1.0 – 192.168.1.15

192.168.1.16/28192.168.1.16 – 192.168.1.31

Subnet Calculator

/27 at a glance

CIDR Prefix/27

Netmask255.255.255.224

Wildcard Mask0.0.0.31

Netmask (Hex)0xFFFFFFE0

Total Addresses32

Usable Hosts30

Host Bits5

Fit in a /248

Binary Mask11111111.11111111.11111111.11100000

A /27 fixes the first 27 bits of the address as the network and leaves 5 bits for hosts, so it holds 2^5 = 32 addresses. The first is the network address and the last is the broadcast address, leaving 30 for hosts.

Thirty usable addresses. A popular size for a dedicated server that hosts VMs or containers with their own IPs.

Most networks filter BGP announcements longer than /24, so a block this size cannot be routed on the internet on its own; it is carved out of a larger block by your provider.

Other IPv4 Prefixes