Broadcast Address Calculator – Last IP in Subnet
Find the broadcast address (last IP) for any subnet.
About This Calculator
Find the broadcast address (last IP) for any subnet. Use the calculator above for instant results.
Worked Examples
Example 1: 192.168.1.0/24
- Broadcast: 192.168.1.255 | Last host: 192.168.1.254
Answer: 192.168.1.255
Example 2: 10.0.0.0/8
- Broadcast: 10.255.255.255
Answer: 10.255.255.255
Example 3: 172.16.0.0/20
- Broadcast: 172.16.15.255 | Last host: 172.16.15.254
Answer: 172.16.15.255
Who Uses This Calculator?
Network Engineers
Find broadcast for subnet planning.
IT Admins
Subnet configuration.
CCNA Students
Subnetting practice.
CS Students
Networking exam prep.
Common Mistakes to Avoid
❌ Broadcast = network OR wildcard
OR the network address with the wildcard mask. All host bits set to 1.
❌ Cannot assign to a device
Packets to broadcast address are delivered to all hosts on the subnet.
Frequently Asked Questions
Formula?
Network address OR wildcard mask. Wildcard = NOT subnet mask.
Directed vs limited broadcast?
Directed (subnet broadcast): forwarded by routers. Limited (255.255.255.255): stays on local segment. Limited broadcast is rarely used.
/24 broadcast always ends in .255
/24 subnet always has broadcast ending in .255. For /25: first half .127, second half .255.