DNS 1 FORMERR vs 3 NXDOMAIN
Both DNS 1 (FORMERR) and 3 (NXDOMAIN) belong to the DNS Response Codes (RCODEs) category. 1 indicates that format error. The name server was unable to interpret the query due to a malformed DNS message. Meanwhile, 3 means that non-Existent Domain. The queried domain name does not exist in the DNS namespace.
คำอธิบาย
Format error. The name server was unable to interpret the query due to a malformed DNS message.
เมื่อคุณพบเห็น
Your DNS client or library sent a query the server could not parse, often caused by a buggy resolver, corrupted packet, or unsupported EDNS options.
วิธีแก้ไข
Check your DNS client or library version for known bugs. Capture the raw query with dig or Wireshark and verify it conforms to the DNS wire format.
คำอธิบาย
Non-Existent Domain. The queried domain name does not exist in the DNS namespace.
เมื่อคุณพบเห็น
The domain has no DNS records at all — either it was never registered, has expired, or you have a typo in the hostname.
วิธีแก้ไข
Double-check the domain spelling. If you own the domain, verify your registrar settings and ensure the nameservers are correctly delegated.
ความแตกต่างหลัก
DNS 1: Format error. The name server was unable to interpret the query due to a malformed DNS message.
DNS 3: Non-Existent Domain. The queried domain name does not exist in the DNS namespace.
You encounter 1 when your DNS client or library sent a query the server could not parse, often caused by a buggy resolver, corrupted packet, or unsupported EDNS options.
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.
ควรใช้อันไหนเมื่อไร
For 1 (FORMERR): Check your DNS client or library version for known bugs. Capture the raw query with dig or Wireshark and verify it conforms to the DNS wire format. For 3 (NXDOMAIN): Double-check the domain spelling. If you own the domain, verify your registrar settings and ensure the nameservers are correctly delegated.