On Wed, 1 Sep 2021, Michel Py via ARIN-PPML wrote:

Hi list and ARIN,

I have a dumb question : under what conditions is it OK to use an ARIN IP 
address in another RIR region ?

I have a specific situation in mind : a global organization (with physical 
infrastructure in all 5 RIRs) is using ARIN addresses in a country in the RIPE 
region (and most likely elsewhere).
I do not want to point fingers, as I suspect that this is a quite common 
situation. But it is related to the subject at hand.

This used to be a grey area open to interpretation. Some years ago, it became official policy. Check out section 9 of the NRPM (Out of Region Use). Basically, as long as certain conditions are met (designed to discourage RIR-shopping by out of region organizations), it is explicitly permitted.


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