question about bogon prefix

Song Li refresh.lsong at
Tue Jun 10 03:00:41 UTC 2014

Hi everyone,

I found many ISP announced bogon prefix, for example:

OriginAS Announcement Description
AS7018	unallocated
AS209 unallocated

my question is why the tier1 and other ISP announce these unallocated 
bogon prefixes, and another interesting question is:

If I am ISP, can I announce the same bogon prefix( with 
AS7018 announced? Will this result in prefix hijacking?


Song Li
Room 4-204, FIT Building,
Network Security,
Department of Electronic Engineering,
Tsinghua University, Beijing 100084, China
Tel:( +86) 010-62446440
E-mail: refresh.lsong at

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