Can I use Shift like I would Google’s DNS or my ISPs?
Nope. Unlike your ISPs DNS, or Google’s Public DNS (220.127.116.11 and 18.104.22.168), the Shift service will throttle requests coming from unknown locations.
To avoid rate limiting and in order to apply policies and monitor requests for your users, you MUST register a location in your Shift admin console. Registering a location is a simple step where you name the location and supply the EGRESS IP addresses of the location - the public external IP used by the modem/router for that site.
Once shift sees the IP in the source IP field of the DNS request, it will associate it with your OrgID and location, will not apply rate limiting, log the request and apply the appropriate location policy on the response.
(If your site has a dynamic IP, you can use a dymanic DNS service to configure the location).