The first transition was to IPv4, and it was reportedly (I wasn’t in the workforce yet :-) relatively easy… https://www.internetsociety.org/blog/2016/09/final-

The first transition was to IPv4, and it was reportedly (I wasn’t in the workforce yet :-) relatively easy… https://www.internetsociety.org/blog/2016/09/final-report-on-tcpip-migration-in-1983/ https://www.internetsociety.org/blog/2016/09/final-report-on... Some more interesting history reading here: https://datatracker.ietf.org/doc/html/rfc33 https://datatracker.ietf.org/doc/html/rfc33