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
20759 5.51% 14257094121 47.35%
2 348329 92.40% 8263336301 27.45%
3 h2
h2-16
h2-15
h2-14
spdy/3.1
spdy/3
http/1.1
248 0.07% 4906369974 16.30%
4 http/1.1
3425 0.91% 1621266376 5.38%
5 spdy/3.1
spdy/3
http/1.1
107 0.03% 547497047 1.82%
6 h2
h2-fb
http/1.1
31 0.01% 309239392 1.03%
7 h2
spdy/3.1
http/1.1
704 0.19% 85998867 0.29%
8 grpc-exp
h2
62 0.02% 40183327 0.13%
9 h2
223 0.06% 30856526 0.10%
10 spdy/3
http/1.1
341 0.09% 9251367 0.03%
11 apns-security-v3
apns-pack-v1
2 0.00% 8619321 0.03%
12 h2
h2-fb
10 0.00% 4028116 0.01%
13 http/1.1
spdy/3.1
h2-14
h2
107 0.03% 4008722 0.01%
14 h2
h2-16
h2-15
h2-14
http/1.1
21 0.01% 3358519 0.01%
15 h2-16
h2-15
h2-14
h2
spdy/3.1
http/1.1
92 0.02% 3100224 0.01%
16 http/1.1
spdy/3.1
h2
89 0.02% 2040268 0.01%
17 http/1.1
http/1.0
39 0.01% 1303121 0.00%
18 http/1.1
spdy/3.1
139 0.04% 1247113 0.00%
19 h2
spdy/3.1
ahfs/1.0
http/1.1
4 0.00% 1191979 0.00%
20 spdy/3
spdy/3.1
http/1.1
127 0.03% 1090183 0.00%

Selected ALPNs (Server Hello)

Rank ALPN Fingerprints % Fingerprints Connections % Connections
1 454987 74.85% 13321621030 62.81%
2 h2 65563 10.79% 4303774749 20.29%
3 http/1.1 86102 14.16% 3549783933 16.74%
4 grpc-exp 106 0.02% 23444336 0.11%
5 apns-pack-v1:4096:4096 5 0.00% 7442753 0.04%
6 spdy/3.1 976 0.16% 3522202 0.02%
7 http/1.1 4 0.00% 211296 0.00%
8 h2-fb 7 0.00% 15040 0.00%
9 bep-relay 9 0.00% 11650 0.00%
10 fbvp 12 0.00% 1123 0.00%
11 rtmp 5 0.00% 1077 0.00%
12 http/1.0 14 0.00% 1056 0.00%
13 h2-14 65 0.01% 965 0.00%
14 h2 2 0.00% 585 0.00%
15 spdy/3 24 0.00% 270 0.00%
16 x-amzn-mqtt-ca 4 0.00% 119 0.00%
17 bep/1.0 8 0.00% 85 0.00%
18 h2-16 8 0.00% 24 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 27093 7.19% 21760317630 72.27%
2 h2 22753 6.04% 19649939667 65.26%
3 spdy/3.1 2307 0.61% 5557344399 18.46%
4 spdy/3 1141 0.30% 5466364052 18.16%
5 h2-14 712 0.19% 4919213274 16.34%
6 h2-16 502 0.13% 4913120532 16.32%
7 h2-15 456 0.12% 4912998729 16.32%
8 h2-fb 125 0.03% 313707868 1.04%
9 grpc-exp 85 0.02% 40188235 0.13%
10 apns-security-v3 3 0.00% 8758606 0.03%
11 apns-pack-v1 3 0.00% 8729383 0.03%
12 ahfs/1.0 10 0.00% 1935029 0.01%
13 http/1.0 53 0.01% 1308706 0.00%
14 apns-security-v2 3 0.00% 600994 0.00%
15 spdy/2 206 0.05% 366757 0.00%
16 x-amzn-mqtt-ca 9 0.00% 58030 0.00%
17 quic 32 0.01% 49972 0.00%
18 spdy/3.1-fb-0.5 5 0.00% 34162 0.00%
19 spdy/1 109 0.03% 34138 0.00%
20 HTTP-draft-09/2.0 3 0.00% 33615 0.00%