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
160215 0.25% 24809627227 92.82%
2 http/1.1
119964 0.19% 5077038979 18.99%
3 289484 0.45% 4746838759 17.76%
4 grpc-exp
h2
52 0.00% 151139273 0.57%
5 h2
h2-fb
http/1.1
34 0.00% 143242414 0.54%
6 h2
555 0.00% 96090719 0.36%
7 h2
h2-16
h2-15
h2-14
spdy/3.1
spdy/3
http/1.1
151 0.00% 90399713 0.34%
8 spdy/3.1
spdy/3
http/1.1
59 0.00% 14242076 0.05%
9 h2
spdy/3.1
http/1.1
254 0.00% 8030952 0.03%
10 http/1.1
h2
7244 0.01% 4945112 0.02%
11 http/1.1
https/1.1
7 0.00% 3470988 0.01%
12 apns-security-v3
apns-pack-v1
15 0.00% 2897517 0.01%
13 http/0.9
http/1.0
http/1.1
spdy/1
spdy/2
spdy/3
h2
h2c
hq
28 0.00% 2227962 0.01%
14 http/1.1
http/1.0
38 0.00% 1542270 0.01%
15 hq
h2c
h2
spdy/3
spdy/2
spdy/1
http/1.1
http/1.0
http/0.9
16 0.00% 1132766 0.00%
16 h2
h2-fb
5 0.00% 1130736 0.00%
17 h2
http/1.1
http/1.0
27 0.00% 501227 0.00%
18 hq
h2c
spdy/3
spdy/2
spdy/1
http/1.0
http/0.9
6 0.00% 445842 0.00%
19 http/0.9
http/1.0
spdy/1
spdy/2
spdy/3
h2c
hq
6 0.00% 445722 0.00%
20 x-amzn-mqtt-ca
35 0.00% 242391 0.00%

Selected ALPNs (Server Hello)

Rank ALPN Fingerprints % Fingerprints Connections % Connections
1 5419081 78.83% 8783252108 82.15%
2 h2 783353 11.39% 981480119 9.18%
3 http/1.1 655864 9.54% 923076053 8.63%
4 grpc-exp 26 0.00% 954140 0.01%
5 apns-pack-v1:4096:4096 5 0.00% 90045 0.00%
6 x-amzn-mqtt-ca 23 0.00% 60686 0.00%
7 x-amzn-http-ca 7 0.00% 6578 0.00%
8 http/1.1 4 0.00% 5832 0.00%
9 bep-relay 3 0.00% 1626 0.00%
10 ncp 2 0.00% 1503 0.00%
11 mqtt 2 0.00% 531 0.00%
12 h2 1 0.00% 260 0.00%
13 fbvp 4 0.00% 260 0.00%
14 h2-14 3 0.00% 167 0.00%
15 http/1.0 3 0.00% 124 0.00%
16 spdy/3.1 1 0.00% 9 0.00%

Popular ALPNs supported by clients

Rank ALPN Fingerprints % Fingerprints Connections % Connections
1 http/1.1 289003 0.45% 30157955440 112.83%
2 h2 169221 0.26% 25309580421 94.69%
3 grpc-exp 92 0.00% 151152033 0.57%
4 h2-fb 114 0.00% 144376715 0.54%
5 spdy/3.1 1148 0.00% 113421982 0.42%
6 spdy/3 765 0.00% 109269289 0.41%
7 h2-14 380 0.00% 90695280 0.34%
8 h2-16 275 0.00% 90472250 0.34%
9 h2-15 271 0.00% 90470151 0.34%
10 http/1.0 163 0.00% 6511023 0.02%
11 spdy/2 477 0.00% 4620625 0.02%
12 h2c 109 0.00% 4500183 0.02%
13 spdy/1 357 0.00% 4471014 0.02%
14 http/0.9 93 0.00% 4466429 0.02%
15 hq 70 0.00% 4456817 0.02%
16 https/1.1 7 0.00% 3470988 0.01%
17 apns-security-v3 16 0.00% 2907673 0.01%
18 apns-pack-v1 16 0.00% 2898597 0.01%
19 quic 37 0.00% 321130 0.00%
20 x-amzn-mqtt-ca 35 0.00% 242391 0.00%