DNS 0 NOERROR vs 3 NXDOMAIN
Both DNS 0 (NOERROR) and 3 (NXDOMAIN) belong to the DNS Response Codes (RCODEs) category. 0 indicates that no error condition. The query completed successfully and the response contains the requested data. Meanwhile, 3 means that non-Existent Domain. The queried domain name does not exist in the DNS namespace.
Description
No error condition. The query completed successfully and the response contains the requested data.
When You See It
This is the normal, successful response to any DNS query — the name was resolved and the answer section contains the requested records.
How to Fix
No fix needed. RCODE 0 means the DNS lookup succeeded as expected.
Description
Non-Existent Domain. The queried domain name does not exist in the DNS namespace.
When You See It
The domain has no DNS records at all — either it was never registered, has expired, or you have a typo in the hostname.
How to Fix
Double-check the domain spelling. If you own the domain, verify your registrar settings and ensure the nameservers are correctly delegated.
Key Differences
DNS 0: No error condition. The query completed successfully and the response contains the requested data.
DNS 3: Non-Existent Domain. The queried domain name does not exist in the DNS namespace.
You encounter 0 when this is the normal, successful response to any DNS query — the name was resolved and the answer section contains the requested records.
You encounter 3 when the domain has no DNS records at all — either it was never registered, has expired, or you have a typo in the hostname.
When to Use Which
For 0 (NOERROR): No fix needed. RCODE 0 means the DNS lookup succeeded as expected. For 3 (NXDOMAIN): Double-check the domain spelling. If you own the domain, verify your registrar settings and ensure the nameservers are correctly delegated.