TCP SYN (JA4T)

65535_2-1-3-1-1-8-4-0-0_1446_6

first seen 2026-09-29 12:33 · last seen 2026-10-18 18:56 · 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 window65535
Option kinds2-1-3-1-1-8-4-0-0
MSS1446
Window scale6

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
t12d380500_10ed599f3404_67a080e8974e2

HTTP request (JA4H)

fingerprintco-occurrences
ge20nr110000_65ce3e7a57b3_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: chromium 151.0.7922.34, chromium 153.0.8010.12, chromium 156.0.8078.4, +13 more.The fingerprint page shows the full measured match list. More on the catalog.6
ge20nn120000_1d5643f8516d_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: chromium 151.0.7922.34, chromium 153.0.8010.12, chromium 156.0.8078.4, +13 more.The fingerprint page shows the full measured match list. More on the catalog.2
ge11nn040000_5b1e8b5f4d2d_000000000000_0000000000002
ge20nr12enus_9c600a72754c_000000000000_0000000000002
ge20nn13enus_30dc68305204_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;4:6291456;6:262144|15663105|1:1:0:220|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chromium 149.0.7827.102, chrome 152.0.7977.83, +81 more.The fingerprint page shows the full measured match list. More on the catalog.8
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, +57 more.The fingerprint page shows the full measured match list. More on the catalog.3

TCP SYN (p0f)

fingerprintco-occurrences
4:47+17:0:1446:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df,ecn:06
4:48+16:0:1446:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df,ecn:03
4:47+17:0:1446:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df:02
4:49+15:0:1446:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df,ecn:01
4:48+16:0:1446:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df:01

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/147.0.7727.15 Safari/537.368
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.363
Mozilla/5.02

Country

fingerprintco-occurrences
GB · United Kingdom13

Network (ASN)

fingerprintco-occurrences
AS5607 · Sky UK Limited13

TLS supported groups

fingerprintco-occurrences
0a0a,11ec,001d,0017,0018 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 155.0.8059.40, chrome 156.0.8078.73, chromium 156.0.8078.47, +8 more.The fingerprint page shows the full measured match list. More on the catalog.11

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_653d80c3fe9d4