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1. Class별 Public IP Address의 범위
ClassPublic IP의 범위 (Dec)Public IP의 범위 (Bin)
A1.xxx.xxx.xxx ~ 126.xxx.xxx.xxx00000001.xxxxxxxx.xxxxxxxx.xxxxxxxx
~
01111110.xxxxxxxx.xxxxxxxx.xxxxxxxx
B128.1.xxx.xxx ~ 191.254.xxx.xxx10000000.00000001.xxxxxxxx.xxxxxxxx
~
10111111.11111110.xxxxxxxx.xxxxxxxx
C192.0.1.xxx ~ 223.255.254.xxx11000000.00000000.00000001.xxxxxxxx
~
11011111.11111111.11111110.xxxxxxxx
2. Class별 Private IP Address의 범위
ClassPrivate IP의 범위
A10.0.0.0 ~ 10.255.255.25510.0.0.0/810.0.0.0                      255.0.0.0
B172.16.0.0 ~ 172.31.255.255172.16.0.0/12172.16.0.0                 255.240.0.0 
C192.168.0.0 ~ 192.168.255.255192.168.0.0/16192.168.0.0               255.255.0.0 
3. Subnet Mask 표
SubnetSubnet Mask (Dec)Host 수비고
/8255.0.0.016,777,216A Class Default Subnet Mask
/9255.128.0.08,388,608A Class Subnet Mask
/10255.192.0.04,194,304
/11255.224.0.02,097,152
/12255.240.0.01,048,576
/13255.248.0.0524,288
/14255.252.0.0262,144
/15255.254.0.0131,072
/16255.255.0.065,536B Class Default Subnet Mask
/17255.255.128.032,768B Class Subnet Mask
/18255.255.192.016,384
/19255.255.224.08,192
/20255.255.240.04,096
/21255.255.248.02,048
/22255.255.252.01,024
/23255.255.254.0512
/24255.255.255.0256C Class Default Subnet Mask
/25255.255.255.128128C Class Subnet Mask
/26255.255.255.19264
/27255.255.255.22432
/28255.255.255.24016
/29255.255.255.2488
/30255.255.255.2524
/31255.255.255.2542
/32255.255.255.2551


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