/30 Subnet

A /30 has 4 addresses, 2 of them usable by hosts. Its netmask is 255.255.255.252. Enter any address below to see its /30 network.

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IP Address / Prefix

Examples:

IPv4 network

2 usable hosts · 192.168.1.1 to 192.168.1.2

Private (RFC 1918)

Details

Netmask

Wildcard Mask

Broadcast

First Usable

Last Usable

Usable Hosts

Total Addresses

Netmask in Binary

Split Into Subnets

192.168.1.0/31192.168.1.0 – 192.168.1.1

192.168.1.2/31192.168.1.2 – 192.168.1.3

Subnet Calculator

/30 at a glance

CIDR Prefix/30

Netmask255.255.255.252

Wildcard Mask0.0.0.3

Netmask (Hex)0xFFFFFFFC

Total Addresses4

Usable Hosts2

Host Bits2

Fit in a /2464

Binary Mask11111111.11111111.11111111.11111100

A /30 fixes the first 30 bits of the address as the network and leaves 2 bits for hosts, so it holds 2^2 = 4 addresses. The first is the network address and the last is the broadcast address, leaving 2 for hosts.

Two usable hosts. The traditional size for point-to-point links between routers, now often replaced by /31.

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