The following information applies to the situation where you want to use our DNS servers as secondary, ie, our servers will download the DNS records for your domains from other DNS servers by using AXFR.
Allowing IP Addresses
Our systems download data from your DNS servers via AXFR from the following IP addresses, so AXFR must be enabled.
Our system follows the REFRESH and RETRY information in the domain’s SOA header to determine if there has been any change to the primary DNS. Our servers do not accept notifications from your primary DNS servers.
If you have made a change and need to speed it up on our servers, use the schedule AXFR button – our system will try to perform a new check in a few minutes.