Read a subnet boundary
Network+: Networking Concepts
Original starter lesson / sources checked 2026-09-30
An IPv4 /26 leaves six host bits, creating blocks of 64 addresses. Under conventional IPv4 subnetting, network and broadcast addresses are reserved.
For 192.168.10.64/26 the range is .64 through .127, with ordinary host addresses .65 through .126.
An address outside the local subnet normally needs a router. Evaluate the mask alongside the IP rather than assuming matching first octets mean local reachability.
Hands-on lab
- Write the network, first host, last host, and broadcast for 192.168.10.128/26.
- Check your result by counting the size of the address block.
Put the lesson to work
Original exam-style practice. Choose the best answer for the stated scenario.
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