TCP SYN (JA4T)

64860_2-4-8-1-3_1380_9

first seen 2026-07-03 18:49 · last seen 2026-10-15 04:15 · JSON

Distinct clients per day (last 30 days, peak 1/day)

Distinct clients are counted by IP-hash per complete UTC day — unlike observation counts this is insensitive to one chatty client, but NAT merges clients and address rotation splits them.

Decomposed attributes

TCP window64860
Option kinds2-4-8-1-3
MSS1380
Window scale9

Co-observed signals

Signals from other families seen in the same observation. A fingerprint spread thinly across many lower-layer signatures is a classic inconsistency signal.

TLS ClientHello (JA4)

fingerprintco-occurrences
t13d1516h2_8daaf6152771_d8a2da3f94cd Match?Exact match in Thumbprint's published controlled catalog captures: chromium 149.0.7827.102, chrome 149.0.7827.102, chrome 149.0.7827.156, +25 more.The fingerprint page shows the full measured match list. More on the catalog.11
t13d1516h2_8daaf6152771_806a8c22fdea Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chrome 151.0.7922.137, chromium 151.0.7922.34, +28 more.The fingerprint page shows the full measured match list. More on the catalog.3

HTTP request (JA4H)

fingerprintco-occurrences
ge20nr100000_65cf54e683ea_000000000000_00000000000010
ge20nn120000_1d5643f8516d_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: chromium 151.0.7922.34, chromium 156.0.8078.4, chromium 153.0.8010.12, +13 more.The fingerprint page shows the full measured match list. More on the catalog.3
ge20nn120000_48520df6af75_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;4:6291456;6:262144|15663105|1:1:0:256|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chromium 131.0.6778.33, chromium 151.0.7922.34, chrome 151.0.7922.137, +60 more.The fingerprint page shows the full measured match list. More on the catalog.4
1:65536;2:0;4:6291456;6:262144|15663105|7:1:0:220|m,a,s,p4
1:65536;2:0;4:6291456;6:262144|15663105|9:1:0:220|m,a,s,p2
1:65536;2:0;4:6291456;6:262144|15663105|9:1:7:220|m,a,s,p2
1:65536;2:0;4:6291456;6:262144|15663105|11:1:0:220|m,a,s,p2

TCP SYN (p0f)

fingerprintco-occurrences
4:46+18:0:1380:mss*47,9:mss,sok,ts,nop,ws:df,id+:08
4:45+19:0:1380:mss*47,9:mss,sok,ts,nop,ws:df,id+:03
4:39+25:0:1380:mss*47,9:mss,sok,ts,nop,ws:df,id+:03

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (iPhone; CPU iPhone OS 17_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.0 Mobile/15E148 Safari/604.111
Mozilla/5.0 (iPhone; CPU iPhone OS 17_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.6 Mobile/15E148 Safari/604.13

Country

fingerprintco-occurrences
CN · China14

Network (ASN)

fingerprintco-occurrences
AS4134 · CHINANET BACKBONE7
AS137266 · CHINATELECOM Hubei province Wuhan 5G network4
AS56047 · China Mobile communications corporation3

TLS supported groups

fingerprintco-occurrences
0a0a,11ec,001d,0017,0018 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 156.0.8078.48, edge 155.0.4283.62, chrome 156.0.8078.47, +11 more.The fingerprint page shows the full measured match list. More on the catalog.3

Cross-transport links

TLS ClientHello fingerprints observed from the same client via the beacon's correlation id on the other transport (e.g. this stack over TCP ↔ that stack over QUIC).

fingerprintlinked observations
q13d0311h3_55b375c5d22e_653d80c3fe9d2