Prior to delegating .RU, .SU, .РФ and third-level domains, the specified DNS servers may be checked for operation. Therefore, when placing a domain registration or delegation request, you should check "Run DNS servers testing".
The tests will be run for four days every three hours and will be deemed successful, if all DNS servers listed in the request meet the requirements of the Domains Registration Schedule in the appropriate TLD.
In the event of any DNS server failure (the server does not exist, out of access or fails to respond to the queries), all queries to this DNS server will stop. A repeated query to DNS server will be made at the next test session (in 3-4 hours). Upon four days' expiry, testing will be stopped. In this case:
DNS servers testing is run in the following sequence:
Upon each test session an error message or notification on successful testing will be sent to the address specified in the "mnt-nfy" field of the form.