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
9568 2.98% 10350305348 44.32%
2 304779 94.80% 6708615439 28.73%
3 h2
h2-16
h2-15
h2-14
spdy/3.1
spdy/3
http/1.1
237 0.07% 4414988842 18.91%
4 http/1.1
3001 0.93% 1006769858 4.31%
5 spdy/3.1
spdy/3
http/1.1
103 0.03% 487039413 2.09%
6 h2
h2-fb
http/1.1
30 0.01% 241566494 1.03%
7 h2
spdy/3.1
http/1.1
675 0.21% 70829204 0.30%
8 grpc-exp
h2
57 0.02% 18689006 0.08%
9 h2
194 0.06% 13603013 0.06%
10 spdy/3
http/1.1
312 0.10% 8118525 0.03%
11 apns-security-v3
apns-pack-v1
1 0.00% 7211761 0.03%
12 http/1.1
spdy/3.1
h2-14
h2
105 0.03% 3514549 0.02%
13 h2
h2-fb
10 0.00% 3372678 0.01%
14 h2
h2-16
h2-15
h2-14
http/1.1
19 0.01% 3066760 0.01%
15 h2-16
h2-15
h2-14
h2
spdy/3.1
http/1.1
87 0.03% 2891813 0.01%
16 http/1.1
spdy/3.1
h2
87 0.03% 1739670 0.01%
17 http/1.1
spdy/3.1
136 0.04% 1067507 0.00%
18 http/1.1
http/1.0
35 0.01% 1047183 0.00%
19 h2
spdy/3.1
ahfs/1.0
http/1.1
4 0.00% 1029584 0.00%
20 spdy/3
spdy/3.1
http/1.1
120 0.04% 964481 0.00%

Selected ALPNs (Server Hello)

Rank ALPN Fingerprints % Fingerprints Connections % Connections
1 417053 75.40% 11279330473 62.03%
2 h2 56325 10.18% 3815165522 20.98%
3 http/1.1 78582 14.21% 3065162778 16.86%
4 grpc-exp 90 0.02% 13396341 0.07%
5 apns-pack-v1:4096:4096 4 0.00% 6705067 0.04%
6 spdy/3.1 938 0.17% 3408103 0.02%
7 http/1.1 3 0.00% 189824 0.00%
8 h2-fb 7 0.00% 13140 0.00%
9 bep-relay 9 0.00% 10814 0.00%
10 rtmp 5 0.00% 1035 0.00%
11 fbvp 10 0.00% 956 0.00%
12 h2-14 64 0.01% 947 0.00%
13 http/1.0 12 0.00% 904 0.00%
14 spdy/3 24 0.00% 265 0.00%
15 h2 1 0.00% 199 0.00%
16 bep/1.0 8 0.00% 85 0.00%
17 h2-16 8 0.00% 21 0.00%
18 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 15312 4.76% 16600266595 71.09%
2 h2 11433 3.56% 15127629296 64.78%
3 spdy/3.1 2200 0.68% 4988208294 21.36%
4 spdy/3 1065 0.33% 4913020431 21.04%
5 h2-14 672 0.21% 4426503511 18.96%
6 h2-16 477 0.15% 4421171738 18.93%
7 h2-15 431 0.13% 4421101054 18.93%
8 h2-fb 119 0.04% 245336025 1.05%
9 grpc-exp 78 0.02% 18693402 0.08%
10 apns-pack-v1 2 0.00% 7313922 0.03%
11 apns-security-v3 2 0.00% 7309939 0.03%
12 ahfs/1.0 10 0.00% 1715357 0.01%
13 http/1.0 48 0.01% 1051713 0.00%
14 apns-security-v2 3 0.00% 532906 0.00%
15 spdy/2 189 0.06% 316796 0.00%
16 quic 24 0.01% 49017 0.00%
17 x-amzn-mqtt-ca 7 0.00% 36741 0.00%
18 spdy/3.1-fb-0.5 5 0.00% 29746 0.00%
19 HTTP-draft-09/2.0 3 0.00% 29667 0.00%
20 spdy/1 101 0.03% 27261 0.00%