TCP SYN (JA4T)

42340_2-4-8-1-3_1460_8

first seen 2026-07-24 09:57 · last seen 2026-10-23 22:07 · 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 window42340
Option kinds2-4-8-1-3
MSS1460
Window scale8

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
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.1
t13d4412h1_fd39b124ee10_58ed7828516f1
t13d1111h2_9dea1a5626e3_9ced094328c91
t13d0811h2_702d7ce1938f_9ced094328c91

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn04enus_989c7cc05c9b_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.1
ge20nn030000_bf75ddd0bb29_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;4:6291456;6:262144;4:1048576|15663105|1:0:0:256|m,a,s,p2
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.1

TCP SYN (p0f)

fingerprintco-occurrences
4:42+22:0:1460:mss*29,8:mss,sok,ts,nop,ws:df,id+:01
4:46+18:0:1460:mss*29,8:mss,sok,ts,nop,ws:df,id+:01
4:47+17:0:1460:mss*29,8:mss,sok,ts,nop,ws:df,id+:01
4:49+15:0:1460:mss*29,8:mss,sok,ts,nop,ws:df,id+,ecn:01

User-Agent

fingerprintco-occurrences
curl/8.14.11
Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.5 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.6 Safari/537.361

Country

fingerprintco-occurrences
RS · Serbia2
HK · Hong Kong SAR China1
ZA · South Africa1

Network (ASN)

fingerprintco-occurrences
AS211619 · MAXKO d.o.o.2
AS139659 · LUCIDACLOUD LIMITED1
AS328510 · Ikeja Wireless (Pty) Ltd1

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.1