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Carrier IRR Update Frequency

On 1/1/18 10:17 AM, Mike Hammett wrote:
> Any idea how often Cogent, XO, and Level 3 update their prefix filters from the IRRDBs?

Back when I had Level3 circuits, they updated at midnight Mountain time. 
I don't know if that's still the case, especially now that CenturyLink 
has gobbled them up ...