A repeatable five-step recipe that gives you the network address, broadcast address, usable range, and number of hosts for any IPv4 address and mask in under 30 seconds. Worked examples included.
Mask 255.255.255.224. Interesting octet = 4 (value 224). Magic number = 256 − 224 = 32. Largest multiple of 32 ≤ 42 is 32. Network = 192.168.10.32. Broadcast = 192.168.10.32 + 32 − 1 = 192.168.10.63. Usable = .33 through .62. That is 30 hosts.
2 more sections in this chapter, plus a 3-question quiz and a hands-on lab.
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