ALPN IDs used with QUIC

An informal table of TLS Application-Layer Protocol Negotiation (ALPN) Protocol IDs that are known to have been used with QUIC.

While IANA holds the formal registration table of Protocol IDs at https://www.iana.org/assignments/tls-extensiontype-values/tls-extensiontype-values.xhtml#alpn-protocol-ids, there are several values that are known to be used with QUIC in the wild.

Identification Sequence	Notes
h3-NN	HTTP/3 over QUIC I-D draft
h3	HTTP/3 over QUIC v1
h3-T0NN	Google variant of HTTP/3 over QUIC
h3-Q0NN	Google variant of HTTP/3 over QUIC
http/2+quic	Google variant of HTTP/3 over QUIC
http/2+quic/NN	Google variant of HTTP/3 over QUIC
quic	Google variant of HTTP/3 over QUIC
h3-fb-NN	Facebook variant of HTTP/3 over QUIC I-D draft
hq-NN	HTTP/0.9 over QUIC I-D draft, used for interoperability testing
hq	HTTP/0.9 over QUIC v1, used for interoperability testing
hq-interop	HTTP/0.9 over QUIC v1, used for interoperability testing
smb	SMB over QUIC
perf	Performance testing protocol over QUIC (https://datatracker.ietf.org/doc/draft-banks-quic-performance/)
siduck	Simple DATAGRAM test over QUIC (https://datatracker.ietf.org/doc/draft-pardue-quic-siduck/)
siduck-NN	Simple DATAGRAM test over QUIC
wq-vvv-NN	WebTransport QuicTransport (https://tools.ietf.org/html/draft-vvv-webtransport-quic-02#section-9.1)
doq-iNN	DNS over QUIC (https://datatracker.ietf.org/doc/draft-ietf-dprive-dnsoquic/)
qrt-NN	QRT: QUIC RTP Tunnelling (https://datatracker.ietf.org/doc/draft-hurst-quic-rtp-tunnelling/)
libp2p	libp2p
xmpp-client	XMPP over QUIC (https://xmpp.org/extensions/xep-0467.html), client to server connections
xmpp-server	XMPP over QUIC (https://xmpp.org/extensions/xep-0467.html), server to server connections