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 <brenna...@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 <mattli...@rivervalleyinternet.net > <mailto:mattli...@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?
