Similar to SMTPS

RFC 2322

Hyper Text Coffee Pot Control Protocol

Real-Time Streaming Protocol

Virtual Router Redundancy Protocol

IP Payload Compression Protocol

VCard

ICalendar

Differentiated services

Point-to-Point Protocol over Ethernet

WebDAV

Year 10,000 problem

Internet Printing Protocol

Diffie–Hellman key exchange

S/MIME

Point-to-Point Tunneling Protocol

Secure Hypertext Transfer Protocol

Layer 2 Tunneling Protocol

Simple public-key infrastructure

Multicast Listener Discovery

Common Open Policy Service

Media Gateway Control Protocol

RADIUS

H.248

Session Announcement Protocol

MISTY1

Sieve (mail filtering language)

Multiprotocol Label Switching

6to4