The IP address for axfr.everydns.net is always listening for AXFR requests. If you have set the permissions for your domain to allow AXFR from everyone or your source ip address than it will succeed. All other transfers will fail like this:
$ dig @axfr.everydns.net no.domain.invalid AXFR;; communications error to 64.158.219.3#53: end of file
Important: The permissions system for the AXFR system updates twice per hour. Changes to your permissions for your domain on the website may not be active until thirty minutes have elapsed.
We deliberately do not permit AXFRs of Secondary Domains. Point your slaves at the same master nameserver EveryDNS is pointed at, rather than trying to point your slaves at an EveryDNS server.
On windows use might want to use the "nslookup" command, though using the "dig" command on a linux/unix box tends to be easier and better.