TCP SYN (JA4T)

64240_2-4-8-1-3_1200_7

first seen 2026-07-17 05:43 · last seen 2026-08-30 20:03 · JSON

Distinct clients per day (last 30 days, peak 2/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 window64240
Option kinds2-4-8-1-3
MSS1200
Window scale7

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_02713d6af862 Match?Exact match in Thumbprint's published controlled catalog captures: chromium 131.0.6778.33, chromium 134.0.6998.35, chromium 133.0.6943.16.The fingerprint page shows the full measured match list. More on the catalog.5
t13d4412h1_fd39b124ee10_58ed7828516f2
t13d1517h2_8daaf6152771_b1ff8ab2d16f2

HTTP request (JA4H)

fingerprintco-occurrences
ge20nr08enus_48f5c0c9641d_000000000000_0000000000002
ge20nr08ruru_48f5c0c9641d_000000000000_0000000000002
ge11nn050000_b223a0ebb0b5_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: python-requests 2.34.2, python-requests 2.33.1, python-requests 2.32.3.The fingerprint page shows the full measured match list. More on the catalog.2
ge20nr08trtr_48f5c0c9641d_000000000000_0000000000002
ge20nn09enus_58cd8a8d2455_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 149.0.7827.102, +59 more.The fingerprint page shows the full measured match list. More on the catalog.6
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, +43 more.The fingerprint page shows the full measured match list. More on the catalog.1

TCP SYN (p0f)

fingerprintco-occurrences
4:50+14:0:1200:mss*44,7:mss,sok,ts,nop,ws:df,id+:03
4:49+15:0:1200:mss*44,7:mss,sok,ts,nop,ws:df,id+:03
4:52+12:0:1200:mss*44,7:mss,sok,ts,nop,ws:df,id+:02
4:53+11:0:1200:mss*44,7:mss,sok,ts,nop,ws:df,id+:01

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/148.0.0.0 YaBrowser/26.6.0.0 Safari/537.363
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.4 Safari/605.1.152
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.6.8 Safari/605.1.152
Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.164 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Brave Chrome/89.0.4389.90 Safari/537.361

Country

fingerprintco-occurrences
US · United States3
RU · Russia2
TR · Turkey2
VE · Venezuela1
BA · Bosnia & Herzegovina1

Network (ASN)

fingerprintco-occurrences
AS16509 · Amazon.com, Inc.2
AS12389 · PJSC Rostelecom2
AS215540 · GLOBAL CONNECTIVITY SOLUTIONS LLP2
AS14618 · Amazon.com, Inc.1
AS269832 · MDS TELECOM C.A.1
AS25144 · Telekomunikacije Republike Srpske akcionarsko drustvo Banja Luka1

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_5a1f323ef56d2