RE: pharming.. dns cache insertion...

At 2:02 PM -0700 2005-04-08, bruce wrote:

> i got to thinking about this after your 1st email... my basic question was,
> is there a list/compilation of valid IP addresses, taking into account that
> the list is completely dynamic.. has anyone tried to compile such a list?
> how the hell would you even do it?

With regards to individual IP addresses, that's not possible.
Among other things, a given IP address range may be validly assigned
to someone, but they may allocate IP addresses out of that range on a
dynamic basis to their clients. Assuming their range is not
completely full, there will always be some addresses which are not
currently assigned -- but you never know which ones.

Now, there is a complete list of valid IP address *ranges*. Team
Cymru maintains a "bogon list" that includes all IP address ranges
that have not yet been assigned to a regional network facility such
as ARIN or RIPE, and therefore the list of valid IP address ranges
would be any range that's not on their bogon list.

--
Brad Knowles, <brad@stop.mail-abuse.org>

"Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety."

-- Benjamin Franklin (1706-1790), reply of the Pennsylvania
Assembly to the Governor, November 11, 1755

SAGE member since 1995. See <http://www.sage.org/> for more info.