Similar to Gopher

Link Control Protocol

Multiprotocol Label Switching

Multicast Listener Discovery

Online Certificate Status Protocol

Point-to-Point Protocol

RADIUS

Request for Comments

Reverse Address Resolution Protocol

Berkeley r-commands

Simple Authentication and Security Layer

Stream Control Transmission Protocol

Syslog

User Datagram Protocol

Cryptographic Message Syntax

Neighbor Discovery Protocol

Tor (network)

Percent-encoding

Character Generator Protocol

Constrained Application Protocol

Daytime Protocol

DHCPv6

Discard Protocol

DNS over HTTPS

Echo Protocol

HTTP/2

HTTP/3

IRC

Media Gateway Control Protocol