[arin-ppml] The problem with IPv4 bogon and listing them

Stephen Sprunk stephen at sprunk.org
Wed Oct 29 19:07:41 EDT 2008

Ted Mittelstaedt wrote:
> Kevin, let's talk about bogons.  We have Cymru running their list here:
> http://www.cymru.com/Documents/bogon-list.html
> but, I'll quote from the text on the list:
> "...IANA allocations change over time, so please check back regularly to ensure you have the latest filters. I can not stress this point strongly enough - these allocations change, as often as every four months...."
> Checking back every 4 MONTHS?  So that means if I request IPv4 that's dirty, on this list, and I get it, that I have to wait 4 months before using it?

No.  According to staff comments, when a block is returned or revoked, 
it is placed on hold for _at least_ 6 mos if it is "clean" and much 
longer if it is "dirty".  If folks keep their bogon (or spammer) filters 
up to date, there should be no problem at all.


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