TCP SYN (JA4T)

65535_2-4-8-1-3_1398_6

first seen 2026-07-24 21:36 · last seen 2026-10-31 18:15 · JSON

Last 7 days (1 observations)

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 window65535
Option kinds2-4-8-1-3
MSS1398
Window scale6

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
t13d1515h1_8daaf6152771_de4a06bb82e34
t13d4312h1_c7886603b240_b26ce05bbdd63
t13d4412h1_fd39b124ee10_58ed7828516f3
t13d1515h1_8daaf6152771_0a20fe35d3a52
t13d1516h1_8daaf6152771_1a63afa7c4781

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.6
ge11nn13enus_9db22d02e17a_000000000000_0000000000006
ge11nn14enus_4a2973d235de_000000000000_0000000000001

TCP SYN (p0f)

fingerprintco-occurrences
4:45+19:0:1398:65535,6:mss,sok,ts,nop,ws:df,id+:03
4:48+16:0:1398:65535,6:mss,sok,ts,nop,ws:df,id+:02
4:42+22:0:1398:65535,6:mss,sok,ts,nop,ws:df,id+:02
4:43+21:0:1398:65535,6:mss,sok,ts,nop,ws:df,id+:02
4:41+23:0:1398:65535,6:mss,sok,ts,nop,ws:df,id+:01
4:44+20:0:1398:65535,6:mss,sok,ts,nop,ws:df,id+:01
4:39+25:0:1398:65535,6:mss,sok,ts,nop,ws:df,id+:01
6:46+18:0:1398:65535,6:mss,sok,ts,nop,ws::01

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.51 Safari/537.362
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.361
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/123.0.0.0 Safari/537.361
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
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.67 Safari/537.361
Mozilla/5.0 (Microsoft Windows NT 10.0.16299.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36 (FTM)1

Country

fingerprintco-occurrences
VN · Vietnam6
AR · Argentina2
IQ · Iraq2
MK · Macedonia2
PK · Pakistan1

Network (ASN)

fingerprintco-occurrences
AS45899 · VNPT Corp3
AS18403 · FPT Telecom Company2
AS43612 · Company for communications services A1 Makedonija DOOEL Skopje2
AS197882 · Tarin General Trading and Setting Up Internet Device LTD2
AS27747 · Telecentro S.A.1
AS138590 · Prime Networks1
AS24086 · Viettel Corporation1
AS274939 · PETERS FABIANO (WI-FI TURBO-AR)1

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.3
0a0a,001d,0017,00182