[gtld-tech] RDAP Port 43 Value

RFC 7483, section 4.7 talks about the port43 member, which is supposed to name the WHOIS server where the object can be found. As a registry, are we supposed to set this value to our WHOIS server, or to the registrar's? The WHOIS protocol has a similar field, which is supposed to be the registrar's server. But that takes the form of a URL, whereas RDAP port43 is explicitly not a URL. So I'm not sure what we are to put in the field, and I couldn't find any directives in the profile document. Thanks. Brian