TCP SYN (JA4T)

64240_2-4-8-1-3-34-1-1_1460_7

first seen 2026-08-28 09:18 · last seen 2026-10-23 22:04 · 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 kinds2-4-8-1-3-34-1-1
MSS1460
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
t13d1516h1_8daaf6152771_d8a2da3f94cd4
t13d3013h2_1d37bd780c83_8537cf56674e Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.18.0.The fingerprint page shows the full measured match list. More on the catalog.2

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn030000_bf75ddd0bb29_000000000000_0000000000002
ge11nn14enus_f373e780f670_000000000000_0000000000002
po11nr15enus_09e4ed5d8ed5_000000000000_0000000000001
ge11nr13enus_e965362ed9da_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
3:100;4:65536;2:0|1048510465|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, curl 8.18.0, curl 8.21.0, +8 more.The fingerprint page shows the full measured match list. More on the catalog.2

TCP SYN (p0f)

fingerprintco-occurrences
4:51+13:0:1460:mss*44,7:mss,sok,ts,nop,ws,?34,nop,nop:df,id+:02
4:52+12:0:1460:mss*44,7:mss,sok,ts,nop,ws,?34,nop,nop:df,id+:01
4:49+15:0:1460:mss*44,7:mss,sok,ts,nop,ws,?34,nop,nop:df,id+:01
4:45+19:0:1460:mss*44,7:mss,sok,ts,nop,ws,?34,nop,nop:df,id+:01
4:44+20:0:1460:mss*44,7:mss,sok,ts,nop,ws,?34,nop,nop:df,id+:01

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.362
curl/8.14.12
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.361

Country

fingerprintco-occurrences
US · United States4
NL · Netherlands1
CA · Canada1

Network (ASN)

fingerprintco-occurrences
AS14061 · DigitalOcean, LLC4
AS16276 · OVH SAS2

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: python-httpx 0.28.1, python-requests 2.34.2, curl 8.23.0, +4 more.The fingerprint page shows the full measured match list. More on the catalog.2