Every RFC was attributed to the “Network Working Group” (before the publication of RFC 5741). What working group is that?
This label in the heading of RFCs is historical in form and symbolic in content. Historically, “network working group” meant the set of researchers who developed the packet switching protocols for the ARPAnet, beginning in 1969. This label was maintained on RFCs as a reminder of the long and significant technical history that is recorded in the RFC series, and as a reminder that today’s technical decisions, wise or not, may be with us for many years. Today, the “Network Working Group” should be interpreted as the set of users, vendors, and researchers who are working to improve and extend the Internet, in particular under the ISOC/IETF umbrella.