TCP SYN (JA4T)

65535_2-4-8-1-3_1452_7

first seen 2026-07-24 09:55 · last seen 2026-10-21 22:38 · 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 window65535
Option kinds2-4-8-1-3
MSS1452
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
t13d1515h1_8daaf6152771_0a20fe35d3a53
t13d1515h1_8daaf6152771_de4a06bb82e33
t13d4312h1_c7886603b240_b26ce05bbdd61
t13d4412h1_fd39b124ee10_58ed7828516f1
t13d1517h2_8daaf6152771_cb7bf5808d99 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 152.0.7977.83, chrome 154.0.8037.57, chrome 152.0.7977.64, +24 more.The fingerprint page shows the full measured match list. More on the catalog.1
t13d1516h1_8daaf6152771_1a63afa7c4781

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn13enus_9db22d02e17a_000000000000_0000000000005
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.2
ge11nn14enus_4a2973d235de_000000000000_0000000000002
ge20nn09ruru_ca95f131f143_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;4:6291456;6:262144|15663105|1:1:0:110|m,a,s,p1

TCP SYN (p0f)

fingerprintco-occurrences
4:51+13:0:1452:65535,7:mss,sok,ts,nop,ws:df,id+:02
4:47+17:0:1452:65535,7:mss,sok,ts,nop,ws:df,id+:02
4:41+23:0:1452:65535,7:mss,sok,ts,nop,ws:df,id+:01
4:52+12:0:1452:65535,7:mss,sok,ts,nop,ws:df,id+:01
4:53+11:0:1452:65535,7:mss,sok,ts,nop,ws:df,id+:01
4:49+15:0:1452:65535,7:mss,sok,ts,nop,ws:df,id+:01
4:37+27:0:1452:65535,7:mss,sok,ts,nop,ws:df,id+:01
4:44+20:0:1452:65535,7: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/131.0.0.0 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/119.0.0.0 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/100.0.4896.75 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 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Brave Chrome/83.0.4103.116 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/153.0.0.0 Safari/537.361

Country

fingerprintco-occurrences
GB · United Kingdom3
NG · Nigeria2
AU · Australia1
RU · Russia1
RS · Serbia1
PK · Pakistan1
KG · Kyrgyzstan1

Network (ASN)

fingerprintco-occurrences
AS2856 · British Telecommunications Limited2
AS29465 · MTN NIGERIA Communication limited2
AS12389 · PJSC Rostelecom1
AS7545 · TPG Telecom Limited1
AS15958 · CETINdoo-NET1
AS6871 · Plusnet1
AS17557 · Pakistan Telecommunication Company Limited1
AS41750 · Mega-Line Ltd.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: php-guzzle 8.3.1, curl 7.88.1, curl 8.13.0, +10 more.The fingerprint page shows the full measured match list. More on the catalog.1