The Internet Engineering Task Force (IETF) Is A Request For Comments?

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Register to read the introduction… RFC1918 describes a set of network ranges set aside for so-called “private use’.
The RFC 1918 ranges are:
Class A: 10.0.0.0 ----- 10.255.255.255 (10/8 prefix)
Class B: 172.16.0.0 ---- 172.31.255.255 (172.16/12 prefix)
Class C: 192.168.0.0 ---- 192.168.255.255 (192.168/16 prefix)
Martian/Bogan addresses are quite interesting. A Martian is a prefix that is not valid for use on the public Internet. They include a variety of reserved or otherwise unusable network addresses the prefixes can’t be assigned to globally routable hosts, therefore a network should never see traffic sourced from those addresses.
A Bogan is a network prefix that is valid but hasn’t yet been allocated by the IANA to an RIR. Because they haven’t been allocated , a network should never see traffic sourced from those addresses as it may be attack traffic that is using an invalid source address for the purpose od concealing the attacker’s identity and/or misdirecting the return traffic.
Samples are:
Typical list of IPv4 Martians includes: 0.0.0.0/0 Default (can be advertised in BGP if
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An example would be at the University of Oxford where there are some devices on the campus which don’t (and should not) need Internet access, such as IP CCTV cameras. These devices would be a good candidate for moving onto RFC1918.
Another example might be the use of VoIP telephones which do not require Internet access, plus at a place like Oxford, printers and network switches which will be allocated RFC1918 addresses.
A Martian packet is an IP packet which specifies a source or destination address that is reserved for special use by the IANA (Internet Assigned Numbers Authority). If seen on the public Internet, these packets can’t actually originate as claimed or be delivered.
However, certain reserved addresses can be routed using multicast, or on private networks, local links or loopback interfaces, depending on which special use range they fall within.

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