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
2812 2.36% 2464241482 43.13%
2 112254 94.10% 1654704578 28.96%
3 h2
h2-16
h2-15
h2-14
spdy/3.1
spdy/3
http/1.1
182 0.15% 1130588810 19.79%
4 http/1.1
1567 1.31% 230415566 4.03%
5 spdy/3.1
spdy/3
http/1.1
85 0.07% 134503550 2.35%
6 h2
h2-fb
http/1.1
18 0.02% 63508906 1.11%
7 h2
spdy/3.1
http/1.1
530 0.44% 19534487 0.34%
8 h2
131 0.11% 2278232 0.04%
9 spdy/3
http/1.1
202 0.17% 2243654 0.04%
10 apns-security-v3
apns-pack-v1
1 0.00% 2215197 0.04%
11 h2-16
h2-15
h2-14
h2
spdy/3.1
http/1.1
60 0.05% 1545749 0.03%
12 grpc-exp
h2
32 0.03% 1308107 0.02%
13 h2
h2-16
h2-15
h2-14
http/1.1
18 0.02% 1191552 0.02%
14 http/1.1
spdy/3.1
h2-14
h2
83 0.07% 1008939 0.02%
15 h2
h2-fb
8 0.01% 897023 0.02%
16 http/1.1
spdy/3.1
h2
76 0.06% 642488 0.01%
17 http/1.1
http/1.0
23 0.02% 305047 0.01%
18 http/1.1
spdy/3.1
101 0.08% 240337 0.00%
19 h2
spdy/3.1
ahfs/1.0
http/1.1
4 0.00% 235094 0.00%
20 http/1.1
spdy/3
spdy/3.1
45 0.04% 215425 0.00%

Selected ALPNs (Server Hello)

Rank ALPN Fingerprints % Fingerprints Connections % Connections
1 194248 72.21% 2614641594 57.86%
2 h2 30217 11.23% 1132532982 25.06%
3 http/1.1 43851 16.30% 767496103 16.98%
4 apns-pack-v1:4096:4096 2 0.00% 2080451 0.05%
5 grpc-exp 51 0.02% 1127430 0.02%
6 spdy/3.1 587 0.22% 1079264 0.02%
7 http/1.1 3 0.00% 43543 0.00%
8 bep-relay 4 0.00% 3054 0.00%
9 h2-fb 6 0.00% 2930 0.00%
10 h2-14 27 0.01% 490 0.00%
11 rtmp 2 0.00% 260 0.00%
12 spdy/3 10 0.00% 84 0.00%
13 fbvp 6 0.00% 68 0.00%
14 bep/1.0 4 0.00% 23 0.00%
15 h2-16 3 0.00% 5 0.00%

Popular ALPNs supported by clients

Rank ALPN Fingerprints % Fingerprints Connections % Connections
1 http/1.1 6380 5.35% 4051815926 70.92%
2 h2 4162 3.49% 3687557298 64.54%
3 spdy/3.1 1679 1.41% 1289624325 22.57%
4 spdy/3 746 0.63% 1268114326 22.20%
5 h2-14 497 0.42% 1134868469 19.86%
6 h2-15 311 0.26% 1133375534 19.84%
7 h2-16 347 0.29% 1133354848 19.84%
8 h2-fb 76 0.06% 64551402 1.13%
9 apns-pack-v1 2 0.00% 2255585 0.04%
10 apns-security-v3 2 0.00% 2229683 0.04%
11 grpc-exp 44 0.04% 1308948 0.02%
12 ahfs/1.0 7 0.01% 424228 0.01%
13 http/1.0 25 0.02% 306376 0.01%
14 apns-security-v2 3 0.00% 174452 0.00%
15 spdy/2 113 0.09% 98846 0.00%
16 quic 7 0.01% 45808 0.00%
17 HTTP-draft-09/2.0 3 0.00% 11332 0.00%
18 spdy/3.1-fb-0.5 4 0.00% 9362 0.00%
19 spdy/1 55 0.05% 4621 0.00%
20 h2c 3 0.00% 3827 0.00%