Bogon filtering is the practice of filtering bogons, which are bogus (fake) IP addresses of a computer network . Bogons include IP packets on the public Internet that contain addresses that are not in any range allocated or delegated by the Internet Assigned Numbers Authority (IANA) or a delegated regional Internet registry (RIR) and allowed for public internet use. The areas of unallocated address space are called the bogon space . Bogons also include reserved private address [1] and link-local address ranges, such as those in 10.0.0.0/8 , 172.16.0.0/12 , 192.168.0.0/16 , and 169.254.0.0/16 , which are reserved for private networks , [1] sometimes also known as Martian packets . May be you are not aware about how many bogon ip exist : which can be 20.4% ( 875,310,464/4billion ips) Source Wikipedia: other links https://en.wikipedia.org/wiki/List_of_countries_by_IPv4_address_allocation
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