Definition/Classification of Bogon

Aftab Siddiqui aftab.siddiqui at
Wed Jul 25 02:46:53 UTC 2018

Hi Bill,

On Tue, 24 Jul 2018 at 23:03 William Herrin <bill at> wrote:

> On Tue, Jul 24, 2018 at 7:24 AM, Aftab Siddiqui
> <aftab.siddiqui at> wrote:
> > Q - Generally, Private or Reserved ASNs are considered as Bogon ASN but
> > what about unallocated ASNs?
> Hi Aftab,
> You can reasonably think of a bogon as any Internet number resource
> which according to the registration authority should not appear on
> whatever network is at issue.

Perfect definition. I have the same opinion. BUT

> Q - Is there any RFC (or even draft) which classify unallocated ASNs as
> > Bogon as well?
> The RFCs offer guidelines and conventions in this, not hard rules. It
> would be an error to treat them as hard rules.

Recently, during a discussion with few decent size service providers who
pointed me to RFC3871 suggesting that the word Bogon is for "IP resources"
only. Hence, I asked this question here.

> > Q - In the above scenario when an RIR deregister a resource (IPv4/v6 or
> > ASN) due to any disagreement (sometimes deregistration happens because of
> > non-payment and can be resolved in a few days/weeks). How long should a
> > service provider wait to mark them as bogon and stop advertising or
> > accepting it?
> In my opinion: until the customer stops paying you or the authority
> assigns the resource to someone else. As long as the resource was
> properly assigned to the customer when they started advertising it,
> there's no real angle to forcibly ending it sooner.

This is the current practice though it isn't the best one.

More information about the NANOG mailing list