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● APPENDIX
Filtering range
The filtering range is calculated based on IP address and subnet mask provided by user as
follows:
The subnet value defines the number of masked bits, which will mask the IP address that
is converted into 32-bit binary; rest of masked out bits are ignored to produce the range
as shown below.
Ex) IP address : 128.128.128.128
If the Subnet is set to 8, converted IP is 1000 0000.1000 0000.1000 0000.1000 0000
and the subnet directs to find matches from the first bit to the 8th bit, produces the
filtering range of 1000 0000.???? ????.???? ????.???? ????, which will be converted
back to IP address range of 128.0.0.0 ~ 128.255.255.255.
If the Subnet is set to 10, converted IP is 1000 0000.1000 0000.1000 0000.1000
0000 and the subnet directs to find matches from the first bit to the 10th bit, produces
the filtering range of 1000 0000.0000.10?? ????.???? ????.???? ????, which will be
converted back to IP address range of 128.0.0.0 ~ 128.191.255.255.
If the Subnet is set to 20, converted IP is 1000 0000.1000 0000.1000 0000.1000 0000
and the subnet directs to find matches from the first bit to the 20th bit, produces the
filtering range of 1000 00001000 0000.1000 ????.???? ????, which will be converted
back to IP address range of 128.128.128.0 ~ 128.128.143.255.
If the Subnet is set to 30, converted IP is 1000 0000.1000 0000.1000 0000.1000 0000
and the subnet directs to find matches from the first bit to the 30th bit, produces the
filtering range of 1000 0000.1000 0000.1000 0000.1000 00??, which will be converted
back to IP address range of 128.128.128.128 ~ 128.128.128.131.
If the Subnet is set to 32, converted IP is 1000 0000.1000 0000.1000 0000.1000 0000
and the subnet directs to find matches from the first bit to the 32th bit, produces the
filtering range of 1000 0000.1000 0000.1000 0000.1000 0000, which will be converted
back to IP address of 128.128.128.128.