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The following table details the function of the most common Domain Name System (DNS) return messages and corresponding response codes (RCodes) that may appear in your logs while doing a DNS query. Each return code has its own purpose in the DNS infrastructure. Typically, you'll see NOERROR (RCODE:0) when doing most of your successful browsing. All of the other return codes are considered errors.
For an exhaustive list of these codes, please see the DNS RCODEs section of this link: Domain Name System (DNS) Parameters
DNS Return Message |
DNS Response Code |
Function |
| NOERROR | RCODE:0 |
DNS Query completed successfully |
| FORMERR | RCODE:1 |
DNS Query Format Error |
| SERVFAIL | RCODE:2 |
Server failed to complete the DNS request |
| NXDOMAIN | RCODE:3 |
Domain name does not exist |
| NOTIMP | RCODE:4 |
Function not implemented |
| REFUSED | RCODE:5 |
The server refused to answer for the query |
| YXDOMAIN | RCODE:6 |
Name that should not exist, does exist |
| XRRSET | RCODE:7 |
RRset that should not exist, does exist |
| NOTAUTH | RCODE:8 |
Server not authoritative for the zone |
| NOTZONE | RCODE:9 |
Name not in zone |