HTTP is also still somewhat popular.

But, seriously, that got me curious. There are many protocols from that early era that are still with us today. NTP, DNS, SMTP, IMAP, BGP, SNMP, NFS, ICMP. If you allow the 1990's as counting as "old" we can add SSH and SSL, DHCP, LDAP.

I feel the need to be pedantic, but I do not mean it to be rude.

What we sometimes call SSL is not the same SSL as back then. That said, TLS was released in 1999, so it just barely makes the cut. :D

TCP