IP conversion tools
| Octet | Decimal | Binary | Hex |
|---|
| CIDR | Subnet Mask (Decimal) | Binary |
|---|
Each 255 octet is eight 1s: 11111111. The trailing 0 octet is 00000000. So 255.255.255.0 = 11111111.11111111.11111111.00000000.
IPv4 is a 32-bit address divided into four equal 8-bit fields for human readability. Each octet ranges from 0 to 255.
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.
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.
Enter a binary number, decimal number, or dotted-decimal IP address. The converter automatically detects the input format and shows all three representations simultaneously. For IP addresses, each octet is converted independently — useful for subnet mask calculations, ACL bitmask construction, and understanding how IPv4 addresses map to binary.
Example: 192.168.1.1 converts to binary 11000000.10101000.00000001.00000001 and decimal 3232235777. To calculate the network and broadcast address from an IP and mask, use our Subnet Calculator. For CIDR notation conversions, try the CIDR Converter.