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Network & IP Calculation Tools

Broadcast Address Calculator

Enter an IPv4 address and prefix or subnet mask to calculate the broadcast address and view the binary network, wildcard, and result.

Accepts every prefix length and verifies that dotted-decimal mask bits are contiguous.

Precisely calculate the broadcast address using Network OR Wildcard, and view the binary operation.

Your input is processed only in your browser and is never uploaded to a server.

What this tool does

The Broadcast Address Calculator focuses on the ending address of a traditional IPv4 subnet. It first calculates Network with IP AND Mask, then calculates Broadcast with Network OR Wildcard, so it correctly handles any prefix, including /26, /20, and /13.

  • The tool never uses shortcuts such as changing the last octet to 255, which works for only some subnets.
  • /31 includes a note that RFC 3021 point-to-point semantics do not use a traditional broadcast address.
  • For /32, the mathematical network and broadcast boundaries are the same and represent a single host route.

How to use it

  1. Enter an IPv4 address.
  2. Enter a prefix or subnet mask.
  3. Click Calculate Broadcast Address.
  4. View the decimal result and binary OR operation.

How it works

The wildcard mask is the bitwise inverse of the subnet mask. Broadcast Address = Network Address OR Wildcard Mask, which preserves the network bits and sets every host bit to 1.

Examples

  • 192.168.1.130/26 → Network 192.168.1.128, Broadcast 192.168.1.191.
  • 10.10.10.10/8 → Broadcast 10.255.255.255.
  • 192.168.1.10/31 → The mathematical end of the range is 192.168.1.11, but an RFC 3021 link does not use traditional broadcast semantics.

Common uses

  • Determine the ending boundary of a traditional IPv4 subnet.
  • Verify network ranges in DHCP, ACL, or routing configurations.
  • Learn how to perform a bitwise OR on the network address and wildcard mask.

Privacy

Inputs and results are processed only in local browser memory. Nothing is uploaded, sent to an online API, or stored automatically.

Broadcast Address Calculator Features

Precisely calculate the broadcast address using Network OR Wildcard, and view the binary operation. Useful for network planning, configuration checks, and troubleshooting; results can be reviewed and copied immediately.

FAQ

What is a broadcast address?

In a traditional IPv4 subnet, it is the address with all host bits set to 1 and is used for directed broadcasts to that subnet.

How is a broadcast address calculated?

First calculate the network address, then perform a bitwise OR with the wildcard mask.

Does /31 have a traditional broadcast address?

Usually not. An RFC 3021 point-to-point link uses both addresses as endpoints. This page still shows the mathematical end of the range and includes an explanation.

Does the tool send data to the broadcast address?

No. It only displays the calculated result and performs no network communication.

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