Available IP query
More intuitive inquiry of available IP segments
Http://www.ctohome.com/linux-vps-pack/ip.php
Use IP to query, IP segment corresponding table
Total IP Subnet Mask Amount of a Class C
/ 30 4 255.255.255.252 1/64
/ 29 8 255.255.255.248 1/32
/ 28 16 255.255.255.240 1/16
/ 27 32 255.255.255.224 1/8
/ 26 64 255.255.255.192 1/4
/ 24 256 255.255.255.0 1
/ 23 512 255.255.254.0 2
/ 22 1024 255.255.252.0 4
/ 21 2048 255.255.248.0 8
/ 20 4096 255.255.240.0 16
/ 19 8192 255.255.224.0 32
/ 18 16384 255.255.192.0 64
/ 17 32768 255.255.128.0 128
/ 16 65536 255.255.0.0 256
