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IANA-BOGONS - Unallocated IPv4 space
This is a collection of report files that summarize the allocation status of the IPv4 address space and the Autonomous Number space. The report is generated on a daily basis using the IANA registry files, the Regional Internet Registry stats files and the Regional Internet Registry whois data.
Many ISPs and end-user firewalls filter and block bogons, because they have no legitimate use, and usually are the result of accidental or malicious misconfiguration.