CIDR

Hmmm, was that 240 or 248?

Short Table of Common Address Blocks

Netmask             CIDR IPs
------------------- ---- -----
255.255.0.0         /16  65536
255.255.128.0       /17  32768
255.255.192.0       /18  16384
255.255.224.0       /19  8192
255.255.240.0       /20  4096
255.255.248.0       /21  2048
255.255.252.0       /22  1024
255.255.254.0       /23  512

255.255.255.0       /24  256
255.255.255.128     /25  128
255.255.255.192     /26  64
255.255.255.224     /27  32
255.255.255.240     /28  16
255.255.255.248     /29  8
255.255.255.252     /30  4

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