online CIDR and IP subnet calculator : Check host

216.15.139.0-216.15.139.127
216.15.139.0/25

216.15.139.128-216.15.139.143
216.15.139.128/28

216.15.139.144-216.15.139.147
216.15.139.144/30

216.15.139.148-216.15.139.148
216.15.139.148/32

216.15.128.0-216.15.135.255
216.15.128.0/21

216.15.136.0-216.15.137.255
216.15.136.0/23

216.15.138.0-216.15.138.255
216.15.138.0/24

IP subnet calculator 216.15.128.0-216.15.139.148