IPv4 Mismanagement

Fri Oct 2 21:44:13 UTC 2020

I suspect many providers don't have good business processes for reclaiming
IP space that was assigned to customers who have either disconnected or
voluntarily returned the space.

The provider I started out with in the mid/late 90s bootstrapped itself
with IP space from MCI (now, CenturyLink... I think?) and UUNET (now
Verizon Business), but we handed those blocks back when we started getting
provider-independent space from ARIN.  No idea what became of that space
after we stopped announcing it.

jms

On Fri, Oct 2, 2020 at 3:38 PM Ryan Wilkins <ryan at deadfrog.net> wrote:

> I have the same thing with a service that was disconnected a couple years
> ago.  Four IP blocks of /24 size are still swipped to us and we’re
> announcing them.  I don’t put any customers on them and just use them for
> temporary things for fear that some day someone will want them back.
>
> On Oct 2, 2020, at 2:50 PM, Matt Brennan <brennanma at gmail.com> wrote:
>
>
> A service I disconnected more than 2 years ago still has a /24 of their
> space SWIPED to me. Their NOC closed the ticket I opened to remove. Unknown
> if it's actually in use for another customer.
>
> I also had a conversation last week with another ISP (we were
> renegotiating our contract) about this. The order form they sent me had
> multiple /28's we had "given back" years ago still listed. Turns out
> they're still being routed to us as well.
>
> I would bet it happens all over the place.
>
> -Matt
>
> On Fri, Oct 2, 2020 at 2:00 PM Matt Hoppes <
> mattlists at rivervalleyinternet.net> wrote:
>
>> I'm sitting here in the office on a Friday performing some IP
>> maintenance and I see that one of our upstreams is still filtering an IP
>> range we haven't used in years.   I dig into it a bit more and it turns
>> out a major carrier still has them SWIPed to us.
>>
>> This got me curious and I dug more into IPs from back in our early days
>> and discovered there are two Tier-1 carriers we no longer do business
>> with that still have large blocks of their own IPs SWIPED and allocated
>> to us.
>>
>> This is really confusing and concerning.   I know it's not the
>> end-all-be-all, but I wonder how much IPv4 exhaustion is being caused by
>> this type of IPv4 mis-management, where IPs are still shown as
>> "allocated" to a customer who hasn't used them in years.
>>
>> I've seen this behavior from Frontier and CenturyLink to name just a few.
>>
>> Any thoughts on this?
>>
>
>
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