Broadcast Address Calculator
Find the broadcast address for any IP address and CIDR prefix length.
- Free to use
- No registration required
- Works on all devices
- Last updated
- 13-09-2026
Enter an IP address and CIDR prefix to find the broadcast address for that subnet.
Your result
10.10.255.255
Broadcast address
Network address10.10.0.0
Subnet mask255.255.0.0
AI explanation
Formula
Broadcast address = network address OR (NOT subnet mask)Worked example
10.10.10.10 / 16
| Field | Value |
|---|---|
| IP address | 10.10.10.10 |
| CIDR prefix (/n) | 16 |
| Broadcast address | 10.10.255.255 |
| Network address | 10.10.0.0 |
| Subnet mask | 255.255.0.0 |
Assumptions
- IPv4 only — IPv6 has no broadcast address (see the IPv6 Subnet Calculator).
- /31 subnets have no separate broadcast address under RFC 3021; /32 is a single host route.
Frequently asked questions
What is a broadcast address used for?
It's a special address used to send a single packet to every host on the subnet at once — commonly used for protocols like DHCP and ARP within a local network.
Can I assign the broadcast address to a device?
No — it's reserved for broadcast traffic and cannot be assigned as a usable host address (except implicitly in /31 point-to-point links, which have no separate broadcast address).
Why doesn't IPv6 have a broadcast address?
IPv6 uses multicast instead, which is more efficient — it lets a packet reach only the hosts that have subscribed to a given multicast group, rather than every host on the subnet.