Networking Essentials / IP addressing
Lesson 9 of 30
Subnets and CIDR
The /number after an IP says how many bits are the network part. /24 leaves 8 bits for devices: 256 addresses, 254 usable.
Key points
- /24 = 255.255.255.0
- Usable hosts = 2^(32-prefix) - 2
- Try the Subnet calculator in Tools
Quiz · +10 XP
How many usable host addresses are in a /24?
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