<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">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.<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Oct 2, 2020, at 2:50 PM, Matt Brennan <<a href="mailto:brennanma@gmail.com" class="">brennanma@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div class=""><br class=""></div><div class="">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. <br class=""></div><div class=""><br class=""></div><div class="">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. </div><div class=""><br class=""></div><div class="">I would bet it happens all over the place. <br class=""></div><div class=""><br class=""></div><div class="">-Matt<br class=""></div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Oct 2, 2020 at 2:00 PM Matt Hoppes <<a href="mailto:mattlists@rivervalleyinternet.net" class="">mattlists@rivervalleyinternet.net</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">I'm sitting here in the office on a Friday performing some IP <br class="">
maintenance and I see that one of our upstreams is still filtering an IP <br class="">
range we haven't used in years. I dig into it a bit more and it turns <br class="">
out a major carrier still has them SWIPed to us.<br class="">
<br class="">
This got me curious and I dug more into IPs from back in our early days <br class="">
and discovered there are two Tier-1 carriers we no longer do business <br class="">
with that still have large blocks of their own IPs SWIPED and allocated <br class="">
to us.<br class="">
<br class="">
This is really confusing and concerning. I know it's not the <br class="">
end-all-be-all, but I wonder how much IPv4 exhaustion is being caused by <br class="">
this type of IPv4 mis-management, where IPs are still shown as <br class="">
"allocated" to a customer who hasn't used them in years.<br class="">
<br class="">
I've seen this behavior from Frontier and CenturyLink to name just a few.<br class="">
<br class="">
Any thoughts on this?<br class="">
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