TCP SYN (JA4T)

64240_2-4-8-1-3_1398_7

first seen 2026-07-23 17:56 · last seen 2026-10-17 18:13 · 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 window64240
Option kinds2-4-8-1-3
MSS1398
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
t13d4412h1_fd39b124ee10_58ed7828516f4
t13d1515h1_8daaf6152771_de4a06bb82e32
t13d4312h1_c7886603b240_b26ce05bbdd61

HTTP request (JA4H)

fingerprintco-occurrences
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.5
ge11nn13enus_9db22d02e17a_000000000000_0000000000002

TCP SYN (p0f)

fingerprintco-occurrences
4:41+23:0:1398:mss*44,7:mss,sok,ts,nop,ws:df,id+:03
4:44+20:0:1398:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
4:45+19:0:1398:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
4:48+16:0:1398:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
4:50+14:0:1398:mss*44,7:mss,sok,ts,nop,ws:df,id+:01

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.75 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.361
Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_3) AppleWebKit/537.36 (KHTML, like Gecko, Mediapartners-Google) Chrome/88.0.4324.175 Safari/537.361

Country

fingerprintco-occurrences
MK · Macedonia3
ES · Spain2
IL · Israel1
VN · Vietnam1

Network (ASN)

fingerprintco-occurrences
AS43612 · Company for communications services A1 Makedonija DOOEL Skopje2
AS212097 · VIM TELECOMUNICACIONES SL2
AS18403 · FPT Telecom Company1
AS12849 · Hot-Net internet services Ltd.1
AS16333 · Company for communications services A1 Makedonija DOOEL Skopje1

TLS supported groups

fingerprintco-occurrences
001d,0017,001e,0019,0018,0100,0101,0102,0103,0104 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, php-guzzle 8.3.1, curl 7.88.1, +10 more.The fingerprint page shows the full measured match list. More on the catalog.1