Security - bogons
Bogons are bogus or fake IP addresses. Bogons include IP addresses that are not in any range allocated or delegated by the Internet Assigned Numbers Authority (IANA) or a delegated regional Internet registry (RIR). The areas of unallocated address space are called the bogon space.
Bogons also include address ranges reserved for private networks loopback interfaces, and link-local addresses, such as:
- 10.0.0.0/8 - IPv4 Private IP address ranges
- 127.0.0.0/8 - IPv4 - Internal Host Loopback Address Range
- 172.16.0.0/12 - IPv4 Private IP address ranges
- 192.168.0.0/16 - IPv4 Private IP address ranges
- 169.254.0.0/16 - IPv4 Link-local address range
Many ISPs and end-user firewalls automatically filter and block bogons, because they have no legitimate use, and usually are the result of accidental misconfiguration or malicious intent.