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
86569 9.14% 32621874031 55.74%
2 848306 89.55% 14684952034 25.09%
3 h2
h2-16
h2-15
h2-14
spdy/3.1
spdy/3
http/1.1
273 0.03% 5423745824 9.27%
4 http/1.1
6271 0.66% 4352549669 7.44%
5 spdy/3.1
spdy/3
http/1.1
135 0.01% 628563365 1.07%
6 h2
h2-fb
http/1.1
42 0.00% 397966149 0.68%
7 h2
spdy/3.1
http/1.1
754 0.08% 130340172 0.22%
8 grpc-exp
h2
76 0.01% 128190735 0.22%
9 h2
461 0.05% 90037760 0.15%
10 spdy/3
http/1.1
397 0.04% 11681196 0.02%
11 apns-security-v3
apns-pack-v1
17 0.00% 10581561 0.02%
12 http/1.1
spdy/3.1
h2-14
h2
112 0.01% 5750515 0.01%
13 h2
h2-fb
12 0.00% 5175794 0.01%
14 http/1.1
http/1.0
57 0.01% 5015084 0.01%
15 h2
h2-16
h2-15
h2-14
http/1.1
24 0.00% 3549848 0.01%
16 h2-16
h2-15
h2-14
h2
spdy/3.1
http/1.1
100 0.01% 3404071 0.01%
17 http/1.1
spdy/3.1
h2
94 0.01% 2476202 0.00%
18 http/1.1
spdy/3.1
147 0.02% 2056489 0.00%
19 http/1.1
h2
210 0.02% 1881577 0.00%
20 h2
spdy/3.1
ahfs/1.0
http/1.1
4 0.00% 1622519 0.00%

Selected ALPNs (Server Hello)

Rank ALPN Fingerprints % Fingerprints Connections % Connections
1 867029 77.45% 31482121723 72.68%
2 h2 128239 11.46% 6210977208 14.34%
3 http/1.1 122818 10.97% 5553004048 12.82%
4 grpc-exp 117 0.01% 55297156 0.13%
5 apns-pack-v1:4096:4096 15 0.00% 8623090 0.02%
6 spdy/3.1 1017 0.09% 3608824 0.01%
7 http/1.1 6 0.00% 317656 0.00%
8 x-amzn-mqtt-ca 16 0.00% 36325 0.00%
9 h2-fb 7 0.00% 15515 0.00%
10 bep-relay 16 0.00% 14689 0.00%
11 h2 2 0.00% 3891 0.00%
12 http/1.0 16 0.00% 2379 0.00%
13 fbvp 12 0.00% 2012 0.00%
14 ncp 7 0.00% 1580 0.00%
15 rtmp 5 0.00% 1164 0.00%
16 h2-14 72 0.01% 1120 0.00%
17 spdy/3 27 0.00% 291 0.00%
18 bep/1.0 8 0.00% 85 0.00%
19 x-amzn-http-ca 2 0.00% 53 0.00%
20 dot 1 0.00% 25 0.00%
21 h2-16 8 0.00% 24 0.00%
22 acme-tls/1 1 0.00% 2 0.00%
23 AVTNG 1 0.00% 1 0.00%
24 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 96769 10.22% 43603978318 74.51%
2 h2 89698 9.47% 38820861171 66.33%
3 spdy/3.1 2979 0.31% 6205867870 10.60%
4 spdy/3 1868 0.20% 6071299816 10.37%
5 h2-14 831 0.09% 5439920992 9.30%
6 h2-16 606 0.06% 5431023805 9.28%
7 h2-15 562 0.06% 5430899424 9.28%
8 h2-fb 204 0.02% 403606390 0.69%
9 grpc-exp 117 0.01% 128199400 0.22%
10 apns-security-v3 18 0.00% 10804776 0.02%
11 apns-pack-v1 18 0.00% 10696621 0.02%
12 http/1.0 200 0.02% 8219603 0.01%
13 spdy/2 807 0.09% 3659098 0.01%
14 spdy/1 696 0.07% 3243115 0.01%
15 h2c 134 0.01% 3226929 0.01%
16 http/0.9 105 0.01% 3193119 0.01%
17 hq 74 0.01% 3191703 0.01%
18 ahfs/1.0 11 0.00% 2600108 0.00%
19 apns-security-v2 3 0.00% 758160 0.00%
20 x-amzn-mqtt-ca 18 0.00% 150995 0.00%