IPv4 network explorer

Understand every address in your subnet.

Enter an IPv4 address and mask to map the network, available hosts, routing addresses, binary boundaries, and more.

/24 CIDR or
dotted mask

Calculator

Inspect a subnet

Subnet mask 255.255.255.0 Wildcard: 0.0.0.255

Total addresses 256 All addresses in this block

Usable hosts 254 Excludes network & broadcast

Address class Class C 192.0.0.0 – 223.255.255.255

Address map

256 addresses

Network 192.168.1.0 Subnet identifier

Usable host range 192.168.1.1 – 192.168.1.254 Devices, servers, clients

Broadcast 192.168.1.255 All hosts on subnet

Bit boundary

24 + 8 bits

Network bits Host bits

Routing notes

More network details

Input address192.168.1.42

Host min192.168.1.1

Host max192.168.1.254

Reverse DNS zone1.168.192.in-addr.arpa

Binary mask11111111.11111111.11111111.00000000

Hex rangeC0A80100 – C0A801FF

Learn by doing

Read the quick guide, then test your understanding in a short practical quiz.

Network addressAll host bits are 0. It names the subnet and is used in routing tables.

Usable addressesUsually assigned to routers, computers, access points, printers, and services.

Broadcast addressAll host bits are 1. It reaches every host in a traditional IPv4 broadcast subnet.

Common convention: the first usable address, such as .1, is often the default gateway. It is a convention—not a rule.

A prefix length says how many of the 32 IPv4 bits identify the network. The remaining bits identify hosts.

11111111.11111111.11111111.00000000

/24 = 24 network bits + 8 host bits

With 8 host bits, there are 2⁸ = 256 total addresses. Normally, two are reserved, leaving 254 usable.

Quick quiz

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