DNS Response Codes

RCODE values returned in DNS response messages to indicate the status of a query.

20 codes

• BADALG Algorithm not supported
• BADCOOKIE Bad or missing server cookie
• BADKEY Key not recognised
• BADMODE Bad TKEY mode
• BADNAME Duplicate key name
• BADSIG Bad TSIG signature
• BADTIME Signature out of time window
• BADTRUNC Bad truncation
• BADVERS Bad OPT version
• FORMERR Format error
• NOERROR No error
• NOTAUTH Not authoritative
• NOTIMP Not implemented
• NOTZONE Name not contained in zone
• NXDOMAIN Non-existent domain
• NXRRSET RR set that should exist does not
• REFUSED Query refused
• SERVFAIL Server failure
• YXDOMAIN Name exists when it should not
• YXRRSET RR set exists when it should not