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
3758 27.48% 273311104 69.37%
2 7250 53.02% 69371608 17.61%
3 http/1.1
1812 13.25% 44474241 11.29%
4 h2
h2-16
h2-15
h2-14
spdy/3.1
spdy/3
http/1.1
93 0.68% 3271120 0.83%
5 grpc-exp
h2
31 0.23% 1112491 0.28%
6 h2
h2-fb
http/1.1
17 0.12% 1033692 0.26%
7 h2
145 1.06% 504119 0.13%
8 spdy/3.1
spdy/3
http/1.1
41 0.30% 430185 0.11%
9 h2
spdy/3.1
http/1.1
117 0.86% 298884 0.08%
10 http/0.9
http/1.0
http/1.1
spdy/1
spdy/2
spdy/3
h2
h2c
hq
11 0.08% 36593 0.01%
11 http/1.1
h2
56 0.41% 26603 0.01%
12 hq
h2c
h2
spdy/3
spdy/2
spdy/1
http/1.1
http/1.0
http/0.9
7 0.05% 17914 0.00%
13 http/1.1
http/1.0
12 0.09% 15872 0.00%
14 apns-security-v3
apns-pack-v1
11 0.08% 15395 0.00%
15 h2
h2-fb
4 0.03% 10206 0.00%
16 http/1.1
spdy/3.1
h2-14
h2
17 0.12% 7781 0.00%
17 http/0.9
http/1.0
spdy/1
spdy/2
spdy/3
h2c
hq
3 0.02% 7350 0.00%
18 hq
h2c
spdy/3
spdy/2
spdy/1
http/1.0
http/0.9
2 0.01% 7322 0.00%
19 h2
spdy/3.1
ahfs/1.0
http/1.1
2 0.01% 5433 0.00%
20 apns-security-v2
1 0.01% 4894 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 6156 45.02% 322964335 81.97%
2 h2 4327 31.65% 279649323 70.98%
3 spdy/3.1 430 3.14% 4033655 1.02%
4 spdy/3 244 1.78% 3782370 0.96%
5 h2-14 150 1.10% 3285649 0.83%
6 h2-15 110 0.80% 3273426 0.83%
7 h2-16 113 0.83% 3273398 0.83%
8 grpc-exp 38 0.28% 1112522 0.28%
9 h2-fb 26 0.19% 1043915 0.26%
10 http/1.0 42 0.31% 90862 0.02%
11 spdy/2 47 0.34% 75123 0.02%
12 spdy/1 37 0.27% 73326 0.02%
13 h2c 30 0.22% 73307 0.02%
14 http/0.9 28 0.20% 73305 0.02%
15 hq 27 0.20% 73280 0.02%
16 apns-security-v3 12 0.09% 15614 0.00%
17 apns-pack-v1 12 0.09% 15398 0.00%
18 ahfs/1.0 6 0.04% 7559 0.00%
19 apns-security-v2 2 0.01% 4897 0.00%
20 quic 15 0.11% 2919 0.00%