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
14577 4.30% 12069225870 45.78%
2 317318 93.51% 7401547523 28.07%
3 h2
h2-16
h2-15
h2-14
spdy/3.1
spdy/3
http/1.1
241 0.07% 4671101127 17.72%
4 http/1.1
3169 0.93% 1267721524 4.81%
5 spdy/3.1
spdy/3
http/1.1
104 0.03% 517627685 1.96%
6 h2
h2-fb
http/1.1
31 0.01% 272755749 1.03%
7 h2
spdy/3.1
http/1.1
688 0.20% 77678031 0.29%
8 grpc-exp
h2
59 0.02% 25048588 0.10%
9 h2
207 0.06% 18071997 0.07%
10 spdy/3
http/1.1
325 0.10% 8705383 0.03%
11 apns-security-v3
apns-pack-v1
1 0.00% 7885011 0.03%
12 http/1.1
spdy/3.1
h2-14
h2
106 0.03% 3764179 0.01%
13 h2
h2-fb
10 0.00% 3683608 0.01%
14 h2
h2-16
h2-15
h2-14
http/1.1
19 0.01% 3213875 0.01%
15 h2-16
h2-15
h2-14
h2
spdy/3.1
http/1.1
88 0.03% 2994458 0.01%
16 http/1.1
spdy/3.1
h2
89 0.03% 1820126 0.01%
17 http/1.1
http/1.0
37 0.01% 1181807 0.00%
18 http/1.1
spdy/3.1
137 0.04% 1152052 0.00%
19 h2
spdy/3.1
ahfs/1.0
http/1.1
4 0.00% 1077896 0.00%
20 spdy/3
spdy/3.1
http/1.1
122 0.04% 1037506 0.00%

Selected ALPNs (Server Hello)

Rank ALPN Fingerprints % Fingerprints Connections % Connections
1 432037 74.92% 12312330165 62.30%
2 h2 61096 10.59% 4073795165 20.61%
3 http/1.1 82307 14.27% 3348454601 16.94%
4 grpc-exp 105 0.02% 16560448 0.08%
5 apns-pack-v1:4096:4096 4 0.00% 7112046 0.04%
6 spdy/3.1 962 0.17% 3483415 0.02%
7 http/1.1 4 0.00% 199418 0.00%
8 h2-fb 7 0.00% 14099 0.00%
9 bep-relay 9 0.00% 11148 0.00%
10 fbvp 12 0.00% 1072 0.00%
11 rtmp 5 0.00% 1058 0.00%
12 h2-14 64 0.01% 956 0.00%
13 http/1.0 12 0.00% 954 0.00%
14 spdy/3 24 0.00% 265 0.00%
15 h2 1 0.00% 239 0.00%
16 x-amzn-mqtt-ca 4 0.00% 92 0.00%
17 bep/1.0 8 0.00% 85 0.00%
18 h2-16 8 0.00% 21 0.00%
19 http/1.1\x00 1 0.00% 1 0.00%

Popular ALPNs supported by clients

Rank ALPN Fingerprints % Fingerprints Connections % Connections
1 http/1.1 20564 6.06% 18906823882 71.72%
2 h2 16497 4.86% 17152673248 65.06%
3 spdy/3.1 2251 0.66% 5282722046 20.04%
4 spdy/3 1098 0.32% 5200519214 19.73%
5 h2-14 689 0.20% 4683267666 17.76%
6 h2-16 485 0.14% 4677563262 17.74%
7 h2-15 439 0.13% 4677473238 17.74%
8 h2-fb 123 0.04% 276861039 1.05%
9 grpc-exp 80 0.02% 25053198 0.10%
10 apns-security-v3 2 0.00% 8002263 0.03%
11 apns-pack-v1 2 0.00% 7991295 0.03%
12 ahfs/1.0 10 0.00% 1777425 0.01%
13 http/1.0 50 0.01% 1186966 0.00%
14 apns-security-v2 3 0.00% 565586 0.00%
15 spdy/2 196 0.06% 349974 0.00%
16 quic 28 0.01% 49050 0.00%
17 x-amzn-mqtt-ca 7 0.00% 44101 0.00%
18 spdy/3.1-fb-0.5 5 0.00% 32447 0.00%
19 HTTP-draft-09/2.0 3 0.00% 31746 0.00%
20 spdy/1 104 0.03% 28072 0.00%