Groups that have such things I can only presume do not do a good job of periodically going through and auditing their IP allocations or, if they do, then they don't do a good enough job of cleaning up all the details. On Fri, Oct 02, 2020 at 05:44:13PM -0400, Justin Streiner wrote:
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@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@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@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?
--- Wayne Bouchard web@typo.org Network Dude http://www.typo.org/~web/