Always list all codes at https://ednscomp.isc.org/ednscomp/
The https://ednscomp.isc.org/ednscomp/ evaluation contains section “Codes” and this section contains sometimes “nsid - NSID supported [RFC5001].”, sometimes it says nothing about NSID. Sometimes the section says “subnet - EDNS Client Subnet supported [RFC7871].” and sometimes it says nothing about subnet. Sometimes it says something about “expire - EDNS EXPIRE supported [RFC7314].” and sometimes it says nothing about expire.
Plesae list all possible codes. When the result is unknown for a code, state “UNKONWN”.