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Namecheap posted their accusations in a blog, but to the best our of knowledge, has yet to contact Go Daddy directly, which would be common practice for situations like this. Normally, the fellow registrar would make a request for us to remove the normal rate limiting block which is a standard practice used by Go Daddy, and many other registrars, to rate limit Whois queries to combat WhoIs abuse.
Because some registrars (and other data gathering, analyzing and reporting entities) have legitimate need for heavy port 43 access, we routinely grant requests for expanded access per an SOP we've had in place for many years. Should we make contact with Namecheap, and learn they need similar access, we would treat that request similarly.
As a side note, we have seen some nefarious activity this weekend which came from non-registrar sources. But, that is not unusual for a holiday weekend, nor would it cause legitimate requests to be rejected. Nevertheless, we have now proactively removed the rate limit for Namecheap, as a courtesy, but it is important to point out, there still may be back-end IP addresses affiliated with Namecheap of which we are unaware. For complete resolution, we should be talking to each other -- an effort we are initiating since they have not done so themselves.
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