Memorandum per la subnet mask con notazione breve e
relativa nota estesa per subnet con gli ip disponibili:
IP/notazione———subnet attiva——————ip disponibili
x.x.x.x/32————–255.255.255.255————–1
x.x.x.x/30————–255.255.255.252————–4
x.x.x.x/29————–255.255.255.248————–8
x.x.x.x/28————–255.255.255.240————–16
x.x.x.x/27————–255.255.255.224————–32
x.x.x.x/26————–255.255.255.192————–64
x.x.x.x/25————–255.255.255.128————–128
x.x.x.x/24————–255.255.255.0 ————–256
x.x.x.x/23————–255.255.254.0 ————–512
x.x.x.x/22————–255.255.252.0 ————–1024
x.x.x.x/21————–255.255.248.0 ————–2048
x.x.x.x/20————–255.255.240.0 ————–4096
x.x.x.x/19————–255.255.224.0 ————–8192
x.x.x.x/18————–255.255.192.0 ————–16384
x.x.x.x/17————–255.255.128.0 ————–32768
x.x.x.x/16————–255.255.0.0 ————–65536
fine