RDAP Extension for DNS Time-To-Live (TTL Values)

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Table of Contents

1. Introduction

While [RFC9083] allows RDAP server operators to provide information about the content of the NS, DS, A and AAAA record(s) which are published in the DNS for a given registry object (domain or host object), it does not provide a mechanism to allow the Time-To-Live (TTL) values of those records to be included in responses.¶

This document describes how TTL information can be included in domain and nameserver objects in RDAP responses.¶

This document is complementary to the EPP TTL extension ([I-D.ietf-regext-epp-ttl]), but registry operators do not need to implement that extension in their EPP server in order to implement this RDAP extension.¶

3. RDAP Response Specification

Servers which support this extension MUST include a ttl_values object in any domain and nameserver objects included in RDAP responses.¶

The ttl_values object has property names which are DNS record types, and values which are integers representing the TTL values used for those record types.¶

Example domain object:¶

{
    "objectClassName": "domain",
    "ldhName": "example.com",
    "ttl_values": {
        "NS": 3600,
        "DS": 60
    }
}

Example nameserver object:¶

{
    "objectClassName": "nameserver",
    "ldhName": "ns1.example.com",
    "ttl_values": {
        "A": 86400,
        "AAAA": 172800
    }
}

4. IANA Considerations

IANA is requested to register the following value in the RDAP Extensions Registry:¶

Extension identifier: ttl¶

Registry operator: Any¶

Published specification: this document¶

Contact: IETF <iesg@ietf.org>¶

Intended usage: this extension describes how DNS TTL values can be included in RDAP responses.¶

Author's Address