Networking
Exam drill
How Many Hosts Fit in a /26?
This subnetting question costs students marks every year
Quick check · tap an answer to continue
Lesson notes
Key points
- A /26 means 26 network bits, leaving 32 minus 26, which is 6 host bits.
- Six host bits give 2 to the power 6, which is 64 total addresses.
- Subtract two: the network address .64 and the broadcast address .127.
- So 64 minus 2 leaves 62 usable host addresses.
Takeaway: Usable hosts = 2^(32 − prefix) − 2.
Quick check: How many usable host addresses are in the subnet 192.168.10.64/26?
- 64
- 62
- 30
Show 2^h − 2 with h = 32 − prefix, and name the network and broadcast addresses.
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