INFO-CODE,Purpose,Reference
0,Other Error,"[RFC8914, Section 4.1]"
1,Unsupported DNSKEY Algorithm,"[RFC8914, Section 4.2]"
2,Unsupported DS Digest Type,"[RFC8914, Section 4.3]"
3,Stale Answer,"[RFC8914, Section 4.4][RFC8767]"
4,Forged Answer,"[RFC8914, Section 4.5]"
5,DNSSEC Indeterminate,"[RFC8914, Section 4.6]"
6,DNSSEC Bogus,"[RFC8914, Section 4.7]"
7,Signature Expired,"[RFC8914, Section 4.8]"
8,Signature Not Yet Valid,"[RFC8914, Section 4.9]"
9,DNSKEY Missing,"[RFC8914, Section 4.10]"
10,RRSIGs Missing,"[RFC8914, Section 4.11]"
11,No Zone Key Bit Set,"[RFC8914, Section 4.12]"
12,NSEC Missing,"[RFC8914, Section 4.13]"
13,Cached Error,"[RFC8914, Section 4.14]"
14,Not Ready,"[RFC8914, Section 4.15]"
15,Blocked,"[RFC8914, Section 4.16]"
16,Censored,"[RFC8914, Section 4.17]"
17,Filtered,"[RFC8914, Section 4.18]"
18,Prohibited,"[RFC8914, Section 4.19]"
19,Stale NXDomain Answer,"[RFC8914, Section 4.20]"
20,Not Authoritative,"[RFC8914, Section 4.21]"
21,Not Supported,"[RFC8914, Section 4.22]"
22,No Reachable Authority,"[RFC8914, Section 4.23]"
23,Network Error,"[RFC8914, Section 4.24]"
24,Invalid Data,"[RFC8914, Section 4.25]"
25,Signature Expired before Valid,[https://github.com/NLnetLabs/unbound/pull/604#discussion_r802678343][Willem_Toorop]
26,Too Early,[RFC9250]
27,Unsupported NSEC3 Iterations Value,[RFC9276]
28,Unable to conform to policy,[draft-homburg-dnsop-codcp-00]
29,Synthesized,[https://github.com/PowerDNS/pdns/pull/12334][Otto_Moerbeek]
30,Invalid Query Type,[RFC9824]
31-49151,Unassigned,
49152-65535,Reserved for Private Use,"[RFC8914, Section 5.2]"