Re: IPv4 Mismanagement

[Ryan Wilkins <ryan () deadfrog net>]

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 <mailto: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?