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
71798 9.22% 27583238264 54.38%
2 696114 89.39% 12839675207 25.31%
3 h2
h2-16
h2-15
h2-14
spdy/3.1
spdy/3
http/1.1
270 0.03% 5337473296 10.52%
4 http/1.1
5235 0.67% 3589628649 7.08%
5 spdy/3.1
spdy/3
http/1.1
134 0.02% 616178705 1.21%
6 h2
h2-fb
http/1.1
36 0.00% 380101558 0.75%
7 h2
spdy/3.1
http/1.1
745 0.10% 122896841 0.24%
8 grpc-exp
h2
71 0.01% 112228294 0.22%
9 h2
341 0.04% 83921840 0.17%
10 spdy/3
http/1.1
389 0.05% 11493536 0.02%
11 apns-security-v3
apns-pack-v1
13 0.00% 10197400 0.02%
12 http/1.1
spdy/3.1
h2-14
h2
111 0.01% 5486520 0.01%
13 h2
h2-fb
10 0.00% 4872575 0.01%
14 h2
h2-16
h2-15
h2-14
http/1.1
22 0.00% 3532938 0.01%
15 http/1.1
http/1.0
56 0.01% 3396310 0.01%
16 h2-16
h2-15
h2-14
h2
spdy/3.1
http/1.1
97 0.01% 3337711 0.01%
17 http/1.1
spdy/3.1
h2
94 0.01% 2441200 0.00%
18 http/1.1
spdy/3.1
147 0.02% 1922875 0.00%
19 http/1.1
h2
186 0.02% 1552112 0.00%
20 h2
spdy/3.1
ahfs/1.0
http/1.1
4 0.00% 1486214 0.00%

Selected ALPNs (Server Hello)

Rank ALPN Fingerprints % Fingerprints Connections % Connections
1 745845 76.47% 26514064106 70.89%
2 h2 114387 11.73% 5757217283 15.39%
3 http/1.1 113731 11.66% 5063874176 13.54%
4 grpc-exp 116 0.01% 54387532 0.15%
5 apns-pack-v1:4096:4096 15 0.00% 8539194 0.02%
6 spdy/3.1 1009 0.10% 3605524 0.01%
7 http/1.1 4 0.00% 280680 0.00%
8 x-amzn-mqtt-ca 9 0.00% 25165 0.00%
9 h2-fb 7 0.00% 15515 0.00%
10 bep-relay 15 0.00% 13810 0.00%
11 h2 2 0.00% 2396 0.00%
12 http/1.0 16 0.00% 2312 0.00%
13 fbvp 12 0.00% 1820 0.00%
14 rtmp 5 0.00% 1164 0.00%
15 h2-14 71 0.01% 1101 0.00%
16 spdy/3 26 0.00% 290 0.00%
17 ncp 5 0.00% 92 0.00%
18 bep/1.0 8 0.00% 85 0.00%
19 h2-16 8 0.00% 24 0.00%
20 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 80688 10.36% 37673832720 74.27%
2 h2 74529 9.57% 33645888697 66.33%
3 spdy/3.1 2835 0.36% 6098859834 12.02%
4 spdy/3 1690 0.22% 5970485810 11.77%
5 h2-14 818 0.11% 5353178031 10.55%
6 h2-16 593 0.08% 5344664674 10.54%
7 h2-15 551 0.07% 5344536592 10.54%
8 h2-fb 195 0.03% 385437406 0.76%
9 grpc-exp 111 0.01% 112235531 0.22%
10 apns-security-v3 14 0.00% 10414037 0.02%
11 apns-pack-v1 14 0.00% 10312192 0.02%
12 http/1.0 144 0.02% 4739381 0.01%
13 ahfs/1.0 11 0.00% 2394956 0.00%
14 spdy/2 643 0.08% 1785355 0.00%
15 spdy/1 536 0.07% 1379994 0.00%
16 h2c 91 0.01% 1366940 0.00%
17 http/0.9 64 0.01% 1333263 0.00%
18 hq 56 0.01% 1332814 0.00%
19 apns-security-v2 3 0.00% 737793 0.00%
20 x-amzn-mqtt-ca 12 0.00% 139083 0.00%