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Transport Layer Security (TLS) Extensions

Transport Layer Security (TLS) Extensions
Created
2005-11-15
Last Updated
2025-07-02
Available Formats

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Registries Included Below

TLS ExtensionType Values
Expert(s)
Yoav Nir, Rich Salz, Nick Sullivan
Reference
[RFC8446][RFC8447][RFC9146][RFC-ietf-tls-tls12-frozen-08][RFC-ietf-tls-rfc8447bis-14]
Note
If the "Specification Required" [RFC8126] procedure applies, 
registration requests can be sent to iana@iana.org or submitted via 
IANA's [application form], per [RFC-ietf-tls-rfc8447bis-14]. IANA 
will forward the submission to the expert mailing list described in 
[RFC 8447, Section 17] and track its progress. See the registration 
procedure table below for more information.
    
Note
The role of the designated expert is described in [RFC8447].
The designated expert [RFC8126] ensures that the specification is
publicly available.  It is sufficient to have an Internet-Draft
(that is posted and never published as an RFC) or a document from
another standards body, industry consortium, university site, etc.
The expert may provide more in-depth reviews, but their approval
should not be taken as an endorsement of the extension.  
    
Note
As specified in [RFC8126], assignments made in the Private Use
space are not generally useful for broad interoperability.  It is
the responsibility of those making use of the Private Use range to
ensure that no conflicts occur (within the intended scope of use).
For widespread experiments, temporary reservations are available.
    
Note
If "Recommended" column is set to "N", it does not necessarily 
mean that it is flawed; rather, it indicates that the item either 
has not been through the IETF consensus process, has limited 
applicability, or is intended only for specific use cases. If the 
"Recommended" column is set to "D," the item is discouraged and 
SHOULD NOT or MUST NOT be used, depending upon the situation; 
consult the item's references for clarity.
    
Note
Abbreviations that may appear in the "TLS 1.3" field include "CH" 
(ClientHello), "SH" (ServerHello), "EE" (EncryptedExtensions), "CT" 
(Certificate), "CR" (CertificateRequest), "NST" (NewSessionTicket), 
and "HRR" (HelloRetryRequest).
    
Note
The addition of the "CR" to the "TLS 1.3" column for the
server_name(0) extension only marks the extension as valid in a 
ClientCertificateRequest created as part of client-generated
authenticator requests.
    
Note
Any TLS entry added after the IESG approves publication of [RFC-ietf-tls-tls12-frozen-08] 
is intended for TLS 1.3 or later, and makes no similar requirement
on DTLS. Such entries should have an informal indication like "For 
TLS 1.3 or later" in that entry, such as the "Comment" column.
    
Available Formats

CSV
Range Registration Procedures "Recommended" set to/transitioning from "Y" or "D" Either Standards Action With Expert Review or IESG Approval "Recommended" set to "N," not transitioning from another value Specification Required Value Extension Name TLS 1.3 DTLS-Only Recommended Reference Comment 0 server_name CH, EE, CR N Y [RFC6066][RFC9261] 1 max_fragment_length CH, EE N N [RFC6066][RFC8449] 2 client_certificate_url - N Y [RFC6066] 3 trusted_ca_keys - N Y [RFC6066] 4 truncated_hmac - N D [RFC6066][IESG Action 2018-08-16][RFC-ietf-tls-rfc8447bis-14][Tag Size Does Matter: Attacks and Proofs for the TLS Record Protocol] 5 status_request CH, CR, CT N Y [RFC6066] 6 user_mapping - N Y [RFC4681] 7 client_authz - N N [RFC5878] 8 server_authz - N N [RFC5878] 9 cert_type - N N [RFC6091] 10 supported_groups (renamed from "elliptic_curves") CH, EE N Y [RFC8422][RFC7919] 11 ec_point_formats - N Y [RFC8422] 12 srp - N N [RFC5054] 13 signature_algorithms CH, CR N Y [RFC8446] 14 use_srtp CH, EE N Y [RFC5764] 15 heartbeat CH, EE N Y [RFC6520] 16 application_layer_protocol_negotiation CH, EE N Y [RFC7301] 17 status_request_v2 - N Y [RFC6961] 18 signed_certificate_timestamp CH, CR, CT N N [RFC6962] 19 client_certificate_type CH, EE N Y [RFC7250] 20 server_certificate_type CH, EE N Y [RFC7250] 21 padding CH N Y [RFC7685] 22 encrypt_then_mac - N Y [RFC7366] 23 extended_master_secret - N Y [RFC7627] 24 token_binding - N Y [RFC8472] 25 cached_info - N Y [RFC7924] 26 tls_lts - N N [draft-gutmann-tls-lts-11] 27 compress_certificate CH, CR N Y [RFC8879] 28 record_size_limit CH, EE N Y [RFC8449] 29 pwd_protect CH N N [RFC8492] 30 pwd_clear CH N N [RFC8492] 31 password_salt CH, SH, HRR N N [RFC8492] 32 ticket_pinning CH, EE N N [RFC8672] 33 tls_cert_with_extern_psk CH, SH N N [RFC8773] 34 delegated_credential CH, CR, CT N Y [RFC9345] 35 session_ticket (renamed from "SessionTicket TLS") - N Y [RFC5077][RFC8447] 36 TLMSP - N N [ETSI TS 103 523-2] 37 TLMSP_proxying - N N [ETSI TS 103 523-2] 38 TLMSP_delegate - N N [ETSI TS 103 523-2] 39 supported_ekt_ciphers CH, EE N Y [RFC8870] 40 Reserved D [RFC-ietf-tls-rfc8447bis-14][tls-reg-review mailing list] 41 pre_shared_key CH, SH N Y [RFC8446] 42 early_data CH, EE, NST N Y [RFC8446] 43 supported_versions CH, SH, HRR N Y [RFC8446] 44 cookie CH, HRR N Y [RFC8446] 45 psk_key_exchange_modes CH N Y [RFC8446] 46 Reserved D [RFC-ietf-tls-rfc8447bis-14][tls-reg-review mailing list] 47 certificate_authorities CH, CR N Y [RFC8446] 48 oid_filters CR N Y [RFC8446] 49 post_handshake_auth CH N Y [RFC8446] 50 signature_algorithms_cert CH, CR N Y [RFC8446] 51 key_share CH, SH, HRR N Y [RFC8446][RFC Errata 5483] 52 transparency_info CH, CR, CT N Y [RFC9162] 53 connection_id (deprecated) - Y D [RFC9146][RFC-ietf-tls-rfc8447bis-14] 54 connection_id CH, SH Y N [RFC9146] 55 external_id_hash CH, EE N Y [RFC8844] 56 external_session_id CH, EE N Y [RFC8844] 57 quic_transport_parameters CH, EE N Y [RFC9001] 58 ticket_request CH, EE N Y [RFC9149] 59 dnssec_chain CH, CT N N [RFC9102][RFC Errata 6860] 60 sequence_number_encryption_algorithms CH, HRR, SH Y N [draft-pismenny-tls-dtls-plaintext-sequence-number-01] 61 rrc CH, SH Y N [draft-ietf-tls-dtls-rrc-10] 62 tls_flags CH,SH,HRR,EE,CR,CT,NST N N [draft-ietf-tls-tlsflags-14] 63-2569 Unassigned 2570 Reserved CH, CR, NST N N [RFC8701] 2571-6681 Unassigned 6682 Reserved CH, CR, NST N N [RFC8701] 6683-10793 Unassigned 10794 Reserved CH, CR, NST N N [RFC8701] 10795-14905 Unassigned 14906 Reserved CH, CR, NST N N [RFC8701] 14907-19017 Unassigned 19018 Reserved CH, CR, NST N N [RFC8701] 19019-23129 Unassigned 23130 Reserved CH, CR, NST N N [RFC8701] 23131-27241 Unassigned 27242 Reserved CH, CR, NST N N [RFC8701] 27243-31353 Unassigned 31354 Reserved CH, CR, NST N N [RFC8701] 31355-35465 Unassigned 35466 Reserved CH, CR, NST N N [RFC8701] 35467-39577 Unassigned 39578 Reserved CH, CR, NST N N [RFC8701] 39579-43689 Unassigned 43690 Reserved CH, CR, NST N N [RFC8701] 43691-47801 Unassigned 47802 Reserved CH, CR, NST N N [RFC8701] 47803-51913 Unassigned 51914 Reserved CH, CR, NST N N [RFC8701] 51915-56025 Unassigned 56026 Reserved CH, CR, NST N N [RFC8701] 56027-60137 Unassigned 60138 Reserved CH, CR, NST N N [RFC8701] 60139-64249 Unassigned 64250 Reserved CH, CR, NST N N [RFC8701] 64251-64767 Unassigned 64768 ech_outer_extensions CH [2] N N [draft-ietf-tls-esni-17] 64769-65036 Unassigned 65037 encrypted_client_hello CH, HRR, EE N N [draft-ietf-tls-esni-17] 65038-65279 Unassigned 65280 Reserved for Private Use [RFC8446] 65281 renegotiation_info - N Y [RFC5746] 65282-65535 Reserved for Private Use [RFC8446] TLS Certificate Types
Expert(s)
Yoav Nir, Rich Salz, Nick Sullivan
Reference
[RFC6091][RFC8446][RFC8447][RFC-ietf-tls-tls12-frozen-08][RFC-ietf-tls-rfc8447bis-14]
Note
If the "Specification Required" [RFC8126] procedure applies, 
registration requests can be sent to iana@iana.org or submitted via 
IANA's [application form], per [RFC-ietf-tls-rfc8447bis-14]. IANA 
will forward the submission to the expert mailing list described in 
[RFC 8447, Section 17] and track its progress. See the registration 
procedure table below for more information.
    
Note
The role of the designated expert is described in [RFC8447].
The designated expert [RFC8126] ensures that the specification is
publicly available.  It is sufficient to have an Internet-Draft
(that is posted and never published as an RFC) or a document from
another standards body, industry consortium, university site, etc.
The expert may provide more in-depth reviews, but their approval
should not be taken as an endorsement of the certificate type.
    
Note
If "Recommended" column is set to "N", it does not necessarily 
mean that it is flawed; rather, it indicates that the item either 
has not been through the IETF consensus process, has limited 
applicability, or is intended only for specific use cases. If the 
"Recommended" column is set to "D," the item is discouraged and 
SHOULD NOT or MUST NOT be used, depending upon the situation; 
consult the item's references for clarity.
    
Note
Any TLS entry added after the IESG approves publication of [RFC-ietf-tls-tls12-frozen-08] 
is intended for TLS 1.3 or later, and makes no similar requirement
on DTLS. Such entries should have an informal indication like "For 
TLS 1.3 or later" in that entry, such as the "Comment" column.
    
Available Formats

CSV
Range Registration Procedures "Recommended" set to/transitioning from "Y" or "D" Either Standards Action With Expert Review or IESG Approval "Recommended" set to "N," not transitioning from another value Specification Required Value Name Recommended Reference Comment 0 X509 Y [RFC6091][RFC Errata 5976] Was X.509 before TLS 1.3. 1 OpenPGP_RESERVED N [RFC6091][RFC8446] Used in TLS versions prior to 1.3. 2 Raw Public Key Y [RFC7250] 3 1609Dot2 N [RFC8902] 4-223 Unassigned 224-255 Reserved for Private Use [RFC6091] TLS Certificate Status Types
Registration Procedure(s)
IETF Review
Reference
[RFC6961][RFC8446][RFC-ietf-tls-tls12-frozen-08][RFC-ietf-tls-rfc8447bis-14]
Note
Any TLS entry added after the IESG approves publication of [RFC-ietf-tls-tls12-frozen-08] 
is intended for TLS 1.3 or later, and makes no similar requirement
on DTLS. Such entries should have an informal indication like "For 
TLS 1.3 or later" in that entry, such as the "Comment" column.
    
Available Formats

CSV
Value Description Reference Comment 0 Reserved [RFC6961] 1 ocsp [RFC6066][RFC6961] 2 ocsp_multi_RESERVED [RFC6961][RFC8446] Used in TLS versions prior to 1.3. 3-255 Unassigned TLS Application-Layer Protocol Negotiation (ALPN) Protocol IDs
Registration Procedure(s)
Expert Review
Expert(s)
Yoav Nir, Rich Salz, Nick Sullivan
Reference
[RFC7301][RFC8447][RFC-ietf-tls-rfc8447bis-14]
Note
Registration requests should be sent to iana@iana.org or submitted 
via IANA's [application form], per [RFC-ietf-tls-rfc8447bis-14]. 
IANA will forward the request to the expert mailing list described in 
[RFC 8447, Section 17] and track its progress.
    
Available Formats

CSV
TLS CachedInformationType Values
Expert(s)
Yoav Nir, Rich Salz, Nick Sullivan
Reference
[RFC7924][RFC-ietf-tls-tls12-frozen-08][RFC-ietf-tls-rfc8447bis-14]
Note
Requests for registration in the "Specification Required" [RFC8126] 
range should be sent to iana@iana.org or submitted via IANA's 
[application form], per [RFC-ietf-tls-rfc8447bis-14]. IANA will 
forward the request to the expert mailing list described in 
[RFC 8447, Section 17] and track its progress. See the registration 
procedure table below for more information.
    
Note
Any TLS entry added after the IESG approves publication of [RFC-ietf-tls-tls12-frozen-08] 
is intended for TLS 1.3 or later, and makes no similar requirement
on DTLS. Such entries should have an informal indication like "For 
TLS 1.3 or later" in that entry, such as the "Comment" column.
    
Available Formats

CSV
Range Registration Procedures 0-63 Standards Action 64-223 Specification Required Value Description Reference Comment 0 Reserved [RFC7924] 1 cert [RFC7924] 2 cert_req [RFC7924] 3-223 Unassigned 224-255 Reserved for Private Use [RFC7924] TLS Certificate Compression Algorithm IDs
Expert(s)
Yoav Nir, Rich Salz, Nick Sullivan
Reference
[RFC8879][RFC-ietf-tls-tls12-frozen-08][RFC-ietf-tls-rfc8447bis-14]
Note
Requests for registration in the "Specification Required" [RFC8126] 
range should be sent to iana@iana.org or submitted via IANA's 
[application form], per [RFC-ietf-tls-rfc8447bis-14]. IANA will 
forward the request to the expert mailing list described in 
[RFC 8447, Section 17] and track its progress. See the registration 
procedure table below for more information.
    
Note
Any TLS entry added after the IESG approves publication of [RFC-ietf-tls-tls12-frozen-08] 
is intended for TLS 1.3 or later, and makes no similar requirement
on DTLS. Such entries should have an informal indication like "For 
TLS 1.3 or later" in that entry, such as the "Comment" column.
    
Available Formats

CSV
Range Registration Procedures 1-255 IETF Review 256-16383 Specification Required 16384-65535 Experimental Use Algorithm Number Description Reference Comment 0 Reserved [RFC8879] 1 zlib [RFC8879] 2 brotli [RFC8879] 3 zstd [RFC8879] 4-16383 Unassigned 16384-65535 Reserved for Experimental Use [RFC8879] Footnotes [1]
This entry reserves an identifier for use within a cleartext version 
of a protocol and is not allowed to appear in a TLS ALPN negotiation.
    
[2]
Only appears in inner CH.
    

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