I am not an expert, but I’m pretty sure the answer is no.
Here’s a block that ARIN still thinks is reallocated to me from Level3 (was Genuity), but that hasn’t been mine for something like 15 years. I think the SWIP database just never got updated. https://whois.arin.net/rest/net/NET-209-100-100-0-1 It would be like if your ex-girlfriend never took her car keys back after the break up, can you go and drive her car? Probably no. From: AF <af-boun...@af.afmug.com> On Behalf Of Steve Jones Sent: Thursday, November 21, 2019 8:14 PM To: AnimalFarm Microwave Users Group <af@af.afmug.com> Subject: [AFMUG] can we use reassigned IP space? we have 4 /24s a /27 and a /27 that have been reassigned to us forever and are still listed with ARIN, lookups still come back to us, one /24 was reassigned to us before i started working here and we have left that provider. Am I able to announce these prefixes? one of the /24 is still a resource under our ASN They dont belong to us, it was just prior upstream reassignment. Its crazy with "depletion" that there is over a thousand IPs just abandoned in our closet
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