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Binary / Decimal IP Converter

IP conversion tools

Binary / Decimal IP Converter

Decimal—
Binary (dotted)—
Hexadecimal—
Integer (32-bit)—

Per-Octet Breakdown

OctetDecimalBinaryHex

Subnet Mask Reference

CIDRSubnet Mask (Decimal)Binary

How to use the binary / decimal ip converter

  1. Paste an IPv4 address. The tool emits the full 32-bit binary, octet by octet.
  2. Reverse direction also works — paste a 32-bit binary string to get dotted decimal back.
  3. Pair this with the subnet calculator to learn binary subnetting fluently.

Frequently asked questions

How do I convert 255.255.255.0 to binary by hand?

Each 255 octet is eight 1s: 11111111. The trailing 0 octet is 00000000. So 255.255.255.0 = 11111111.11111111.11111111.00000000.

Why is each IPv4 octet 8 bits?

IPv4 is a 32-bit address divided into four equal 8-bit fields for human readability. Each octet ranges from 0 to 255.

What is the highest power of 2 needed for /24?

A /24 uses 24 mask bits and 8 host bits. The highest host-bit value is 2^7 = 128. The full host range is 2^8 = 256 addresses.

How does binary subnetting speed up subnet math?

Once you can read binary octets at a glance, network and broadcast become trivial: AND with the mask for network, OR with the inverted mask for broadcast.