DNS 3 NXDOMAIN vs 7 YXRRSET
Both DNS 3 (NXDOMAIN) and 7 (YXRRSET) belong to the DNS Response Codes (RCODEs) category. 3 indicates that non-Existent Domain. The queried domain name does not exist in the DNS namespace. Meanwhile, 7 means that rR Set Exists when it should not. A resource record set exists that the update prerequisite says should not.
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.
Description
RR Set Exists when it should not. A resource record set exists that the update prerequisite says should not.
When You See It
A DNS UPDATE failed because a specific RRset (e.g., an A record) already exists when the prerequisite required it to be absent.
How to Fix
Delete the conflicting RRset before retrying the update, or adjust your prerequisite conditions to match the actual zone state.
Key Differences
DNS 3: Non-Existent Domain. The queried domain name does not exist in the DNS namespace.
DNS 7: RR Set Exists when it should not. A resource record set exists that the update prerequisite says should not.
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.
You encounter 7 when a DNS UPDATE failed because a specific RRset (e.g., an A record) already exists when the prerequisite required it to be absent.
When to Use Which
For 3 (NXDOMAIN): Double-check the domain spelling. If you own the domain, verify your registrar settings and ensure the nameservers are correctly delegated. For 7 (YXRRSET): Delete the conflicting RRset before retrying the update, or adjust your prerequisite conditions to match the actual zone state.