Understanding RCODE responses in the live log

The live log at mytools.management/log may contain RCODE messages such as this one:

If you see System - Checker | RCODE | Description content in the “Rule Applied” column, check them against this RFC1035 table:

RCODE Value Response Code Description
0 NoError No error occurred.
1 Format Error The name server was unable to interpret the query.
2 Server Failure The name server was unable to process this query due to a problem with the name server.
3 Name Error Meaningful only for responses from an authoritative name server, this code signifies that the domain name referenced in the query does not exist.
4 Not Implemented The name server does not support the requested kind of query.
5 Refused The name server refuses to perform the specified operation for policy reasons. For example, a name server may not wish to provide the information to the particular requester, or a name server may not wish to perform a particular operation (e.g., zone transfer) for particular data.
6-15 Reserved For future use