Which subnet does the host 192.168.19.36/27 belong?

192.168.19.0 is the first subnet with a /27 mask, but its host range ends at .31, so .36 does not belong to it.

192.168.19.16 is not a valid subnet address for a /27 mask, as /27 subnets increment by 32 (e.g., .0, .32, .64).

192.168.19.64 is a valid subnet, but its host range begins at .65, meaning .36 is not part of this subnet.

A /27 CIDR mask designates a subnet block size of 32 for the last octet, meaning subnets occur at intervals of 32 (e.g., .0, .32, .64). The host 192.168.19.36 falls within the range of 192.168.19.32 to 192.168.19.63, thus belonging to the 192.168.19.32 subnet.