[menog] number of DNS root servers worldwide

[Bill Woodcock]

> On Apr 6, 2018, at 3:35 PM, "smohammed at cmc.iq" <smohammed at cmc.iq> wrote:
> 
>> Thanks a lot Marty for your prompt support.
>> I do the calculation and its 1012. root servers world wide.

That number is probably a reasonably accurate reflection of the number of letter/city combinations.  It does radically undercount the number of actual servers, though, since individual letters may have (for instance) 24 or more servers in the same city, in clusters attached to different IXPs (for instance, if that’s their deployment model).

                                -Bill

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