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
4047 1.82% 6454537780 43.67%
2 212059 95.51% 4228300272 28.61%
3 h2
h2-16
h2-15
h2-14
spdy/3.1
spdy/3
http/1.1
216 0.10% 2938894654 19.88%
4 http/1.1
2297 1.03% 576124991 3.90%
5 spdy/3.1
spdy/3
http/1.1
102 0.05% 332756092 2.25%
6 h2
h2-fb
http/1.1
23 0.01% 158796744 1.07%
7 h2
spdy/3.1
http/1.1
627 0.28% 50044815 0.34%
8 h2
150 0.07% 6490006 0.04%
9 spdy/3
http/1.1
269 0.12% 5962464 0.04%
10 apns-security-v3
apns-pack-v1
1 0.00% 4954877 0.03%
11 grpc-exp
h2
44 0.02% 4816885 0.03%
12 http/1.1
spdy/3.1
h2-14
h2
98 0.04% 2540578 0.02%
13 h2-16
h2-15
h2-14
h2
spdy/3.1
http/1.1
83 0.04% 2486196 0.02%
14 h2
h2-16
h2-15
h2-14
http/1.1
18 0.01% 2460482 0.02%
15 h2
h2-fb
8 0.00% 2222391 0.02%
16 http/1.1
spdy/3.1
h2
85 0.04% 1299750 0.01%
17 h2
spdy/3.1
ahfs/1.0
http/1.1
4 0.00% 834146 0.01%
18 spdy/3
spdy/3.1
http/1.1
108 0.05% 748505 0.01%
19 http/1.1
http/1.0
32 0.01% 719240 0.00%
20 http/1.1
spdy/3.1
116 0.05% 640815 0.00%

Selected ALPNs (Server Hello)

Rank ALPN Fingerprints % Fingerprints Connections % Connections
1 313872 75.14% 7023459868 60.21%
2 h2 41826 10.01% 2677275253 22.95%
3 http/1.1 61024 14.61% 1952554359 16.74%
4 apns-pack-v1:4096:4096 2 0.00% 4659404 0.04%
5 grpc-exp 69 0.02% 3381493 0.03%
6 spdy/3.1 830 0.20% 2570471 0.02%
7 http/1.1 3 0.00% 148261 0.00%
8 h2-fb 7 0.00% 7397 0.00%
9 bep-relay 6 0.00% 6926 0.00%
10 rtmp 4 0.00% 831 0.00%
11 h2-14 49 0.01% 757 0.00%
12 fbvp 8 0.00% 593 0.00%
13 http/1.0 7 0.00% 365 0.00%
14 spdy/3 18 0.00% 208 0.00%
15 h2 1 0.00% 87 0.00%
16 bep/1.0 6 0.00% 41 0.00%
17 h2-16 3 0.00% 5 0.00%

Popular ALPNs supported by clients

Rank ALPN Fingerprints % Fingerprints Connections % Connections
1 http/1.1 8803 3.96% 10532600475 71.26%
2 h2 5689 2.56% 9626815468 65.13%
3 spdy/3.1 2020 0.91% 3333129192 22.55%
4 spdy/3 939 0.42% 3279747898 22.19%
5 h2-14 608 0.27% 2947780005 19.94%
6 h2-15 386 0.17% 2943977507 19.92%
7 h2-16 425 0.19% 2943958713 19.92%
8 h2-fb 94 0.04% 161330361 1.09%
9 apns-pack-v1 2 0.00% 5033150 0.03%
10 apns-security-v3 2 0.00% 5005781 0.03%
11 grpc-exp 58 0.03% 4819552 0.03%
12 ahfs/1.0 8 0.00% 1405838 0.01%
13 http/1.0 39 0.02% 722127 0.00%
14 apns-security-v2 3 0.00% 377203 0.00%
15 spdy/2 145 0.07% 205038 0.00%
16 quic 13 0.01% 47852 0.00%
17 HTTP-draft-09/2.0 3 0.00% 23534 0.00%
18 spdy/3.1-fb-0.5 5 0.00% 22135 0.00%
19 spdy/1 74 0.03% 15839 0.00%
20 x-amzn-mqtt-ca 4 0.00% 15223 0.00%