📋 Scenario
IT gives each machine cell a /27 slice of 192.168.10.0. A drive was configured as 192.168.10.100/27 and you must document its subnet before adding the PLC, HMI and I/O. The trick: /27 blocks step every 32 addresses, so .100 is NOT in the .0 block — work out exactly which block holds it.
📋 Given
🧮 Useful relations
Host bits = 32 − prefix | Block size = 2^(host bits)
Usable hosts = block size − 2 | Mask octet = 256 − block size