Similar to HTTP_Strict_Transport_Security

Internet Printing Protocol

CAST-256

Diffie–Hellman key exchange

S/MIME

Point-to-Point Tunneling Protocol

Layer 2 Tunneling Protocol

Simple public-key infrastructure

Multicast Listener Discovery

Common Open Policy Service

Media Gateway Control Protocol

H.248

Session Announcement Protocol

MISTY1

Sieve (mail filtering language)

Multiprotocol Label Switching

6to4

Realm-Specific IP

Syslog

SHA-1

SFlow

Session Initiation Protocol

VCDIFF

DHCPv6

Generalized Multi-Protocol Label Switching

STUN

Internationalized domain name

Punycode

Ogg