How many usable host addresses does a /27 subnet provide, and what are the subnet boundaries for /27 subnets within 192.168.1.0/24?

• A./27 provides 2^5 - 2 = 30 usable hosts. Subnet boundaries in 192.168.1.0/24 (magic number = 256-224=32, subnets increment by 32): 192.168.1.0/27 (.0-.31), 192.168.1.32/27 (.32-.63), 192.168.1.64/27 (.64-.95), 192.168.1.96/27 (.96-.127), 192.168.1.128/27 (.128-.159), 192.168.1.160/27 (.160-.191), 192.168.1.192/27 (.192-.223), 192.168.1.224/27 (.224-.255). Eight /27 subnets per /24.
• B./27 provides 30 usable hosts, with subnets at .0, .16, .32, .48 (incrementing by 16).
• C./27 provides 62 usable hosts; it has the same host count as /26.
• D./27 provides 30 usable hosts with subnets incrementing by 64 within a /24.