TCP SYN (JA4T)

64240_2-4-8-1-3_1390_7

first seen 2026-07-27 05:02 · last seen 2026-09-05 06:28 · 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
MSS1390
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
t13d3112h2_e8f1e7e78f70_b26ce05bbdd6 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.5.0, php-curl 7.88.1.The fingerprint page shows the full measured match list. More on the catalog.4
t13d1515h1_8daaf6152771_de4a06bb82e32
t13d4412h1_fd39b124ee10_58ed7828516f1
t13d2013h1_2b729b4bf6f3_e24568c0d4401
t13d1516h1_8daaf6152771_1a63afa7c4781
t13d1515h1_8daaf6152771_0a20fe35d3a51

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn020000_5594a17e7e7e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0, curl 8.18.0, +9 more.The fingerprint page shows the full measured match list. More on the catalog.4
ge11nn13enus_9db22d02e17a_000000000000_0000000000003
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.1
ge11nn030000_fe444ad14866_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.16.0.The fingerprint page shows the full measured match list. More on the catalog.1
ge11nn14enus_4a2973d235de_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
3:100;4:10485760;2:0|1048510465|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0.The fingerprint page shows the full measured match list. More on the catalog.4

TCP SYN (p0f)

fingerprintco-occurrences
4:52+12:0:1390:mss*44,7:mss,sok,ts,nop,ws:df,id+:02
4:51+13:0:1390:mss*44,7:mss,sok,ts,nop,ws:df,id+:02
4:39+25:0:1390:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
4:49+15:0:1390:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
4:45+19:0:1390:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
4:43+21:0:1390:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
4:54+10:0:1390:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
4:47+17:0:1390:mss*44,7:mss,sok,ts,nop,ws:df,id+:01

User-Agent

fingerprintco-occurrences
curl/8.5.04
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.362
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.361
curl/8.21.01
Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.102 Safari/537.361

Country

fingerprintco-occurrences
US · United States5
IR · Iran1
PL · Poland1
ES · Spain1
CL · Chile1
LB · Lebanon1

Network (ASN)

fingerprintco-occurrences
AS7018 · AT&T Enterprises, LLC5
AS5617 · Orange Polska Spolka Akcyjna1
AS57269 · DIGI SPAIN TELECOM S.A1
AS52341 · WOM SpA1
AS48206 · Net Pro sarl1
AS16322 · Parsan Lin Co. PJS1