← IP Addressing & Subnetting learning pathIP Addressing & Subnetting · Module 5 of 10
Network, broadcast and host ranges
Find the network address, broadcast and usable range.
📖 Key ideas
- Network address: all host bits 0 (first address).
- Broadcast address: all host bits 1 (last address).
- Usable hosts lie between them.
- Block size = 256 − interesting octet of the mask.
- Example: 192.168.1.70/26 → network .64, broadcast .127, hosts .65–.126.
💡 Real-life example: A subnet is a row of seats: the first seat is the row label, the last is the announcement speaker, people sit in between.
Network addressFirst address, identifies subnet
Broadcast addressLast address, reaches all hosts
Block sizeIncrement between subnets
Host rangeUsable addresses in a subnet