[arin-ppml] ULA-C

Scott Leibrand scottleibrand at gmail.com
Wed Mar 31 20:29:40 EDT 2010

On Wed 3/31/2010 5:16 PM, Fred Baker wrote:
> Dumb question.
> The complaint with ULAs as presently formulated is that there is a non-zero probability of them colliding.
> If you give a prefix to your favorite admin and have them number their network with it, and then re-assign the prefix to someone else, what's the probability that you have a collision?
> I think you need to accept that once put into use, a ULA will be in use by that administration permanently. You obviously see otherwise.  Fill me in?

You're right, it doesn't make any sense to reassign a block once it's 
been assigned.  However, the question of whether to maintain, remove, or 
mark stale contacts in whois, and/or whether to maintain or remove rDNS 
from companies who've disappeared, is not so straightforward, IMO.

Do you have any opinions on what to do there?


More information about the ARIN-PPML mailing list