IP subnet calculator

129.227.128.0-129.227.142.255

129.227.128.0-129.227.135.255
129.227.128.0/21

129.227.136.0-129.227.139.255
129.227.136.0/22

129.227.140.0-129.227.141.255
129.227.140.0/23

129.227.142.0-129.227.142.255
129.227.142.0/24