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This article is a guide to common DNSFilter DNS return codes.
Every DNS query response includes an accompanying code describing what happened when the query was made. These return codes include short names (DNS return messages) which help to easily understand what they mean.
DNS return codes mostly describe what happened when a query fails. If a query is successful (which is often the case) the return code is RCODE:0; short name NOERROR.
These return codes are included in exports from the DNS Query Log, but not displayed in-app.
Below is a list of the most common DNS return codes. See an exhaustive list on the IANA website.
| Return Code | Return Message | Description |
| RCODE:0 | NOERROR | DNS Query completed successfully |
| RCODE:1 | FORMERR | DNS Query Format Error |
| RCODE:2 | SERVFAIL | Server failed to complete the DNS request |
| RCODE:3 | NXDOMAIN | Domain name does not exist |
| RCODE:4 | NOTIMP | Function not implemented |
| RCODE:5 | REFUSED | The server refused to answer for the query |
| RCODE:6 | YXDOMAIN | Name that should not exist, does exist |
| RCODE:7 | XRRSET | RRset that should not exist, does exist |
| RCODE:8 | NOTAUTH | Server not authoritative for the zone |
| RCODE:9 | NOTZONE | Name not in zone |
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