/28 Subnet

A /28 has 16 addresses, 14 of them usable by hosts. Its netmask is 255.255.255.240. Enter any address below to see its /28 network.

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IP Address / Prefix

Examples:

IPv4 network

14 usable hosts · 192.168.1.1 to 192.168.1.14

Private (RFC 1918)

Details

Netmask

Wildcard Mask

Broadcast

First Usable

Last Usable

Usable Hosts

Total Addresses

Netmask in Binary

Split Into Subnets

192.168.1.0/29192.168.1.0 – 192.168.1.7

192.168.1.8/29192.168.1.8 – 192.168.1.15

Subnet Calculator

/28 at a glance

CIDR Prefix/28

Netmask255.255.255.240

Wildcard Mask0.0.0.15

Netmask (Hex)0xFFFFFFF0

Total Addresses16

Usable Hosts14

Host Bits4

Fit in a /2416

Binary Mask11111111.11111111.11111111.11110000

A /28 fixes the first 28 bits of the address as the network and leaves 4 bits for hosts, so it holds 2^4 = 16 addresses. The first is the network address and the last is the broadcast address, leaving 14 for hosts.

Fourteen usable addresses. A common extra-IP allocation for a dedicated server or small business line.

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