2. The SVCB Record Type

The SVCB DNS RR type (RR type 64) is used to locate alternative endpoints for a service.

The algorithm for resolving SVCB records and associated address records is specified in Section 3.

Other SVCB-compatible RR types can also be defined as needed (see Section 6). In particular, the HTTPS RR (RR type 65) provides special handling for the case of "https" origins as described in Section 9.

SVCB RRs are extensible by a list of SvcParams, which are pairs consisting of a SvcParamKey and a SvcParamValue. Each SvcParamKey has a presentation name and a registered number. Values are in a format specific to the SvcParamKey. Each SvcParam has a specified presentation format (used in zone files) and wire encoding (e.g., domain names, binary data, or numeric values). The initial SvcParamKeys and their formats are defined in Section 7.