For some reason, this question has me lost - particular cidr question Which of the following IP addresses fall into the CIDR block of 18.104.22.168/18? a) 22.214.171.124 b) 126.96.36.199 c) 188.8.131.52 d) 184.108.40.206 e) 220.127.116.11 f) 18.104.22.168 Book lists answers as B,C,E. I see /18 meaning block size of size of 64. I do know this is a class A address being "110". Some reason I am stumped on this one. Any help appreciated.