IP subnet calculator

154.91.224.0-154.91.253.255

154.91.224.0-154.91.239.255
154.91.224.0/20

154.91.240.0-154.91.247.255
154.91.240.0/21

154.91.248.0-154.91.251.255
154.91.248.0/22

154.91.252.0-154.91.253.255
154.91.252.0/23