Application Layer Protocol Negotiation (ALPN)

ALPN provides a way for client's to specify the application protocols they support.

Top Client ALPNs

Rank ALPN Unique Fingerprints % Fingerprints Connections % Connections
1 h2
http/1.1
11571 9.42% 3955973736 71.70%
2 89849 73.11% 802008164 14.54%
3 http/1.1
17487 14.23% 669857020 12.14%
4 h2
h2-16
h2-15
h2-14
spdy/3.1
spdy/3
http/1.1
126 0.10% 29732107 0.54%
5 h2
h2-fb
http/1.1
25 0.02% 18297026 0.33%
6 grpc-exp
h2
46 0.04% 18148099 0.33%
7 h2
244 0.20% 14515836 0.26%
8 spdy/3.1
spdy/3
http/1.1
52 0.04% 4211067 0.08%
9 h2
spdy/3.1
http/1.1
190 0.15% 2179460 0.04%
10 http/1.1
h2
2593 2.11% 497154 0.01%
11 http/0.9
http/1.0
http/1.1
spdy/1
spdy/2
spdy/3
h2
h2c
hq
15 0.01% 372065 0.01%
12 apns-security-v3
apns-pack-v1
15 0.01% 320719 0.01%
13 http/1.1
http/1.0
13 0.01% 238105 0.00%
14 hq
h2c
h2
spdy/3
spdy/2
spdy/1
http/1.1
http/1.0
http/0.9
9 0.01% 169402 0.00%
15 h2
h2-fb
4 0.00% 165048 0.00%
16 http/0.9
http/1.0
spdy/1
spdy/2
spdy/3
h2c
hq
3 0.00% 74612 0.00%
17 hq
h2c
spdy/3
spdy/2
spdy/1
http/1.0
http/0.9
3 0.00% 74415 0.00%
18 hq
h2c
spdy/3
h2
spdy/2
spdy/1
http/1.1
http/1.0
http/0.9
3 0.00% 53769 0.00%
19 http/1.1
h2
quic
7 0.01% 44349 0.00%
20 http/1.1
spdy/3.1
h2-14
h2
26 0.02% 41625 0.00%

Selected ALPNs (Server Hello)

Rank ALPN Fingerprints % Fingerprints Connections % Connections

Popular ALPNs supported by clients

Rank ALPN Fingerprints % Fingerprints Connections % Connections
1 http/1.1 32533 26.47% 4681873261 84.86%
2 h2 15024 12.23% 4040268659 73.23%
3 spdy/3.1 718 0.58% 36304007 0.66%
4 spdy/3 432 0.35% 34742018 0.63%
5 h2-14 255 0.21% 29808313 0.54%
6 h2-16 189 0.15% 29748136 0.54%
7 h2-15 188 0.15% 29747328 0.54%
8 h2-fb 67 0.05% 18462242 0.33%
9 grpc-exp 69 0.06% 18150103 0.33%
10 http/1.0 74 0.06% 1005893 0.02%
11 spdy/2 131 0.11% 748797 0.01%
12 spdy/1 113 0.09% 746494 0.01%
13 h2c 59 0.05% 746240 0.01%
14 http/0.9 48 0.04% 745790 0.01%
15 hq 38 0.03% 744329 0.01%
16 apns-security-v3 16 0.01% 323664 0.01%
17 apns-pack-v1 16 0.01% 321500 0.01%
18 quic 20 0.02% 52154 0.00%
19 x-amzn-mqtt-ca 11 0.01% 18743 0.00%
20 ahfs/1.0 6 0.00% 14496 0.00%