Subnet Calculator

IP Address

CIDR

Result

Network192.168.1.0
Broadcast192.168.1.255
Host Range192.168.1.1 - 192.168.1.254
Usable Hosts254

What a /24 actually contains

Enter an IPv4 address and prefix to get the network address, broadcast address, usable host range and host count.

Subnetting is the piece of networking most people re-learn every time they need it. The prefix says how many bits identify the network, and everything left over addresses hosts.

A /24 leaves eight host bits, which is 256 addresses — but two are reserved, one for the network itself and one for broadcast, leaving 254 you can assign.

What this calculator shows

Network and broadcast addresses for your subnet
The first and last usable host address
How many hosts the prefix actually allows

What to keep in mind

IPv4 only, in dotted-decimal notation.
Network and broadcast addresses are excluded from the usable count, per standard practice.

FAQs

How many hosts fit in a /24?

254. There are 256 addresses in total, minus the network address and the broadcast address.

What does the /24 mean?

The first 24 bits identify the network, equivalent to a 255.255.255.0 mask. The remaining 8 bits address individual hosts.

Why do /31 and /32 report no usable hosts?

A /32 is a single address and a /31 has only two, both consumed by network and broadcast. RFC 3021 does allow /31 on point-to-point links as a special case.

What makes an address private?

Three ranges are reserved for internal use: 10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16. They are not routable on the public internet.

Worked example

A typical office network

Input: 192.168.1.50/24

Output: Network 192.168.1.0 · Broadcast 192.168.1.255 · Hosts .1 to .254

Note: 254 usable addresses, not 256. Forgetting the two reserved ones is the classic off-by-two in capacity planning.

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