Current Updated Bogon List

As on January 10, 2008 Bogon List contain following IP range:

0.0.0.0/8
1.0.0.0/8
2.0.0.0/8
5.0.0.0/8
23.0.0.0/8
27.0.0.0/8
31.0.0.0/8
36.0.0.0/8
37.0.0.0/8
39.0.0.0/8
42.0.0.0/8
46.0.0.0/8
49.0.0.0/8
50.0.0.0/8
100.0.0.0/8
101.0.0.0/8
102.0.0.0/8
103.0.0.0/8
104.0.0.0/8
105.0.0.0/8
106.0.0.0/8
107.0.0.0/8
108.0.0.0/8
109.0.0.0/8
127.0.0.0/8
169.254.0.0/16
173.0.0.0/8
174.0.0.0/8
175.0.0.0/8
176.0.0.0/8
177.0.0.0/8
178.0.0.0/8
179.0.0.0/8
180.0.0.0/8
181.0.0.0/8
182.0.0.0/8
183.0.0.0/8
184.0.0.0/8
185.0.0.0/8
192.0.2.0/24
197.0.0.0/8
198.18.0.0/15
223.0.0.0/8
224.0.0.0/3

Ref: IANA

Last Update: January 10, 2007 13:10 BDT. On November 12 2008, 110/8 and 111/8 removed as APNIC has receive this range for further allocation. 

Bogon Filter

Many ISPs and end user firewalls filter and block bogons, because they have no legitimate use, and are therefore the result of accidental or malicious misconfiguration at the sender. Bogons can be filtered by using router ACLs, DNS blackholing even by BGP blackholing.

When an Administrator wants to use BOGON in their firewall or blackhole design, he MUST know what is BOGON, how it works and the MOST IMPORTANT issue is this is under continues modification process. There should be a automated system to update your firewall which contain BOGON list


Current BOGON List

BOGON

"Bogon" is an informal name for an IP packet on the public Internet that claims to be from an area of the IP address space reserved, but not yet allocated or delegated to any organization by the Internet Assigned Numbers Authority (IANA) or a delegated Regional Internet Registry (RIR). The areas of unallocated address space are called "bogon space".

Simply, IP address which is currently not assigned to any Internet User, But reserved for future allocation called BOGON.

Somebody think that BOGON list is a IP block list, which is not usable or assigned to anyone and also the 'Private IP Block' which is reserved for private use.

IANA has reserved 3 block of IP for private & non Internet use, IP address which is under the IP range:

10/8 (10.0.0.0 to 10.255.255.255)
172.16.0.0/12 (172.16.0.0 - 172.31.255.255)
192.168.0.0/16 (192.168.0.0 to 192.168.255.255)

is not under BOGON list.

In one word, IP which has not been assigned to anyone, not even under Private network IP block and having a chance to assigned in future is called BOGON.

For more Information on Bogon List, Keep an eye on this page, I will add more and more information on 'BOGON' List.