DNS 3 NXDOMAIN vs 22 BADTRUNC
Both DNS 3 (NXDOMAIN) and 22 (BADTRUNC) 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, 22 means that bad truncation. The TSIG record was truncated in a way that makes it impossible to verify the message signature.
Description
Non-Existent Domain. The queried domain name does not exist in the DNS namespace.
Quand vous le voyez
The domain has no DNS records at all — either it was never registered, has expired, or you have a typo in the hostname.
Comment résoudre
Double-check the domain spelling. If you own the domain, verify your registrar settings and ensure the nameservers are correctly delegated.
Description
Bad truncation. The TSIG record was truncated in a way that makes it impossible to verify the message signature.
Quand vous le voyez
A large DNS response was truncated (TC bit set) but the TSIG MAC was computed over the full message, making the truncated version unverifiable.
Comment résoudre
Retry the query over TCP to avoid truncation. If using UDP, ensure your EDNS buffer size is large enough to receive the full signed response.
Différences clés
DNS 3: Non-Existent Domain. The queried domain name does not exist in the DNS namespace.
DNS 22: Bad truncation. The TSIG record was truncated in a way that makes it impossible to verify the message signature.
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 22 when a large DNS response was truncated (TC bit set) but the TSIG MAC was computed over the full message, making the truncated version unverifiable.
Quand utiliser lequel
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 22 (BADTRUNC): Retry the query over TCP to avoid truncation. If using UDP, ensure your EDNS buffer size is large enough to receive the full signed response.