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
3441 2.03% 4881201110 43.02%
2 161122 94.82% 3161193035 27.86%
3 h2
h2-16
h2-15
h2-14
spdy/3.1
spdy/3
http/1.1
205 0.12% 2372530681 20.91%
4 http/1.1
1990 1.17% 463853640 4.09%
5 spdy/3.1
spdy/3
http/1.1
98 0.06% 268609030 2.37%
6 h2
h2-fb
http/1.1
21 0.01% 130128538 1.15%
7 h2
spdy/3.1
http/1.1
587 0.35% 38603764 0.34%
8 h2
143 0.08% 4713095 0.04%
9 spdy/3
http/1.1
249 0.15% 4456134 0.04%
10 apns-security-v3
apns-pack-v1
1 0.00% 4115305 0.04%
11 grpc-exp
h2
41 0.02% 3479962 0.03%
12 h2-16
h2-15
h2-14
h2
spdy/3.1
http/1.1
73 0.04% 2204661 0.02%
13 h2
h2-16
h2-15
h2-14
http/1.1
18 0.01% 2114643 0.02%
14 http/1.1
spdy/3.1
h2-14
h2
94 0.06% 1895504 0.02%
15 h2
h2-fb
8 0.00% 1720976 0.02%
16 http/1.1
spdy/3.1
h2
82 0.05% 1045025 0.01%
17 h2
spdy/3.1
ahfs/1.0
http/1.1
4 0.00% 693360 0.01%
18 spdy/3
spdy/3.1
http/1.1
104 0.06% 568457 0.01%
19 http/1.1
http/1.0
32 0.02% 567345 0.00%
20 http/1.1
spdy/3.1
112 0.07% 482276 0.00%

Selected ALPNs (Server Hello)

Rank ALPN Fingerprints % Fingerprints Connections % Connections
1 260497 73.75% 5167720223 57.98%
2 h2 37164 10.52% 2204601155 24.74%
3 http/1.1 54592 15.46% 1531981024 17.19%
4 apns-pack-v1:4096:4096 2 0.00% 3843553 0.04%
5 grpc-exp 63 0.02% 2443040 0.03%
6 spdy/3.1 779 0.22% 2129846 0.02%
7 http/1.1 3 0.00% 121605 0.00%
8 h2-fb 7 0.00% 4823 0.00%
9 bep-relay 6 0.00% 4578 0.00%
10 h2-14 37 0.01% 618 0.00%
11 rtmp 4 0.00% 568 0.00%
12 fbvp 8 0.00% 484 0.00%
13 spdy/3 17 0.00% 164 0.00%
14 h2 1 0.00% 82 0.00%
15 bep/1.0 5 0.00% 36 0.00%
16 http/1.0 5 0.00% 28 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 7740 4.56% 8171897116 72.02%
2 h2 4975 2.93% 7441446521 65.58%
3 spdy/3.1 1905 1.12% 2688898171 23.70%
4 spdy/3 883 0.52% 2647266625 23.33%
5 h2-14 574 0.34% 2379836302 20.97%
6 h2-15 358 0.21% 2376960804 20.95%
7 h2-16 399 0.23% 2376931602 20.95%
8 h2-fb 89 0.05% 132109730 1.16%
9 apns-pack-v1 2 0.00% 4184026 0.04%
10 apns-security-v3 2 0.00% 4150526 0.04%
11 grpc-exp 55 0.03% 3482183 0.03%
12 ahfs/1.0 8 0.00% 1163938 0.01%
13 http/1.0 34 0.02% 569408 0.01%
14 apns-security-v2 3 0.00% 302895 0.00%
15 spdy/2 135 0.08% 150795 0.00%
16 quic 11 0.01% 47735 0.00%
17 HTTP-draft-09/2.0 3 0.00% 22206 0.00%
18 spdy/3.1-fb-0.5 5 0.00% 18764 0.00%
19 x-amzn-mqtt-ca 3 0.00% 10832 0.00%
20 spdy/1 67 0.04% 10778 0.00%