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
4802 1.71% 7947357702 43.78%
2 268755 95.95% 5407013532 29.79%
3 h2
h2-16
h2-15
h2-14
spdy/3.1
spdy/3
http/1.1
225 0.08% 3420206604 18.84%
4 http/1.1
2634 0.94% 694621156 3.83%
5 spdy/3.1
spdy/3
http/1.1
103 0.04% 387147150 2.13%
6 h2
h2-fb
http/1.1
28 0.01% 183744150 1.01%
7 h2
spdy/3.1
http/1.1
656 0.23% 58999197 0.33%
8 grpc-exp
h2
45 0.02% 9867593 0.05%
9 h2
175 0.06% 9004227 0.05%
10 spdy/3
http/1.1
295 0.11% 7190104 0.04%
11 apns-security-v3
apns-pack-v1
1 0.00% 5661741 0.03%
12 http/1.1
spdy/3.1
h2-14
h2
101 0.04% 3028847 0.02%
13 h2
h2-fb
8 0.00% 2765872 0.02%
14 h2-16
h2-15
h2-14
h2
spdy/3.1
http/1.1
86 0.03% 2690664 0.01%
15 h2
h2-16
h2-15
h2-14
http/1.1
19 0.01% 2657694 0.01%
16 http/1.1
spdy/3.1
h2
87 0.03% 1570073 0.01%
17 h2
spdy/3.1
ahfs/1.0
http/1.1
4 0.00% 928204 0.01%
18 http/1.1
spdy/3.1
129 0.05% 881822 0.00%
19 spdy/3
spdy/3.1
http/1.1
116 0.04% 835124 0.00%
20 http/1.1
http/1.0
32 0.01% 791366 0.00%

Selected ALPNs (Server Hello)

Rank ALPN Fingerprints % Fingerprints Connections % Connections
1 375458 76.21% 8840011842 61.60%
2 h2 46741 9.49% 3116299868 21.72%
3 http/1.1 69373 14.08% 2376955181 16.56%
4 grpc-exp 75 0.02% 7878214 0.05%
5 apns-pack-v1:4096:4096 4 0.00% 5368931 0.04%
6 spdy/3.1 885 0.18% 2924149 0.02%
7 http/1.1 3 0.00% 168109 0.00%
8 h2-fb 7 0.00% 10581 0.00%
9 bep-relay 6 0.00% 9243 0.00%
10 rtmp 4 0.00% 970 0.00%
11 h2-14 62 0.01% 923 0.00%
12 fbvp 10 0.00% 711 0.00%
13 http/1.0 10 0.00% 636 0.00%
14 spdy/3 23 0.00% 251 0.00%
15 h2 1 0.00% 119 0.00%
16 bep/1.0 6 0.00% 52 0.00%
17 h2-16 6 0.00% 10 0.00%

Popular ALPNs supported by clients

Rank ALPN Fingerprints % Fingerprints Connections % Connections
1 http/1.1 10054 3.59% 12717235967 70.06%
2 h2 6562 2.34% 11644561897 64.15%
3 spdy/3.1 2121 0.76% 3879831247 21.37%
4 spdy/3 1013 0.36% 3817027907 21.03%
5 h2-14 640 0.23% 3430344934 18.90%
6 h2-16 453 0.16% 3425713354 18.87%
7 h2-15 410 0.15% 3425696043 18.87%
8 h2-fb 111 0.04% 186857207 1.03%
9 grpc-exp 61 0.02% 9870702 0.05%
10 apns-pack-v1 2 0.00% 5748692 0.03%
11 apns-security-v3 2 0.00% 5725700 0.03%
12 ahfs/1.0 10 0.00% 1567768 0.01%
13 http/1.0 42 0.01% 795139 0.00%
14 apns-security-v2 3 0.00% 459875 0.00%
15 spdy/2 169 0.06% 265171 0.00%
16 quic 14 0.00% 48152 0.00%
17 spdy/3.1-fb-0.5 5 0.00% 24434 0.00%
18 HTTP-draft-09/2.0 3 0.00% 24396 0.00%
19 x-amzn-mqtt-ca 5 0.00% 21860 0.00%
20 spdy/1 90 0.03% 21095 0.00%