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?
