DNS 0 NOERROR vs 5 REFUSED
Both DNS 0 (NOERROR) and 5 (REFUSED) 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, 5 means that query refused. The name server refuses to perform the requested operation for policy reasons.
説明
No error condition. The query completed successfully and the response contains the requested data.
このコードが表示される場合
This is the normal, successful response to any DNS query — the name was resolved and the answer section contains the requested records.
解決方法
No fix needed. RCODE 0 means the DNS lookup succeeded as expected.
説明
Query refused. The name server refuses to perform the requested operation for policy reasons.
このコードが表示される場合
The server rejected your query due to access control — for example, a recursive resolver that only serves its own network, or a zone transfer blocked by ACL.
解決方法
Check the server's allow-query, allow-recursion, or allow-transfer ACLs. If you are not authorized to use this resolver, switch to a public DNS service.
主な違い
DNS 0: No error condition. The query completed successfully and the response contains the requested data.
DNS 5: Query refused. The name server refuses to perform the requested operation for policy reasons.
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 5 when the server rejected your query due to access control — for example, a recursive resolver that only serves its own network, or a zone transfer blocked by ACL.
どちらをいつ使うか
For 0 (NOERROR): No fix needed. RCODE 0 means the DNS lookup succeeded as expected. For 5 (REFUSED): Check the server's allow-query, allow-recursion, or allow-transfer ACLs. If you are not authorized to use this resolver, switch to a public DNS service.