Similar to Time_Protocol

Routing Information Protocol

RTP Control Protocol

Secure Shell

Session Initiation Protocol

Simple Mail Transfer Protocol

Simple Network Management Protocol

Telnet

Transport Layer Security

WHOIS

Service Location Protocol

Chrony

OpenNTPD

Internet protocol suite

Link-local address

Caddy (web server)

DCE Distributed File System

DNS-based Authentication of Named Entities

DNSCrypt

Dynamic synchronous transfer mode

Enhanced Interior Gateway Routing Protocol

Fiber Distributed Data Interface

File eXchange Protocol

HTTPS

IMessage

Interior gateway protocol

Interior Gateway Routing Protocol

LISTSERV