6 Distinct CNA Roles (Sort of)

Nearly everyone is solely a "CNA"

Likely all those Unknown's are "CNA"

Root CNAs

CISA ICS (Also CNA-LR)

Google

JPCERT

Red Hat

INCIBE

MITRE and CISA(not ICS) are Top-Level Root

CISA is currently the sole ADP

MITRE is the sole Secretariat and other CNA-LR