Are any of the SWIPed IP's reachable? Personally I know I've accumulated
a lot of dangling config over the past 20 years. So my first impulse is
just to assume an incorrect SWIP entry and the IP's are used by other
customers who aren't aware of WHOIS records and therefore never
requested a WHOIS update.
You can't be on the waiting list if you already have a /20, so they
don't get gain anything by pretending they're in use. If it's what you
imagine and they have unused IP's mis-classified as allocated, then
eventually they'll run out of "empty" address space and go back to audit
what they've allocated.
On 10/2/2020 1:58 PM, Matt Hoppes 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? What happens if I start advertising these IPs
and trying to use them?
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