On 7 Jan 2020, at 5:01 AM, Martijn Schmidt via NANOG <nanog@nanog.org> wrote:
> 
> Out of curiosity, since we aren't affected by this ourselves, I know of cases 
> where Cogent has sub-allocated IP space to its customers but which those 
> customers originate from their own ASN and then announce to multiple upstream 
> providers.
> 
> So while the IP space is registered to Cogent and allocated to its customer, 
> the AS-path might be something like ^174_456$ but it's entirely possible that 
> ARIN would observe it as ^123_456$ instead. Are such IP address blocks 
> affected by the suspension?

As noted earlier, ARIN has suspended service for all Cogent-registered IP 
address blocks - this is being done as a discrete IP block access list applied 
to relevant ARIN Whois services, so the routing of the blocks are immaterial - 
a customer using a suballocation of Cogent space could be affected but 
customers with their own IP blocks blocks that are simply being routed by 
Cogent are not affected. 

FYI,
/John

John Curran
President and CEO
American Registry for Internet Numbers



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