TCP SYN (JA4T)

64240_2-4-8-1-3_1400_10

first seen 2026-07-24 07:38 · last seen 2026-10-29 08:37 · JSON

Last 7 days (5 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 window64240
Option kinds2-4-8-1-3
MSS1400
Window scale10

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
t13d1516h2_8daaf6152771_806a8c22fdea Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chrome 151.0.7922.137, chromium 151.0.7922.34, +28 more.The fingerprint page shows the full measured match list. More on the catalog.4
t13d311100_e8f1e7e78f70_d41ae481755e Match?Exact match in Thumbprint's published controlled catalog captures: rust-hyper 1.11.1, rust-hyper 1.11.0, rust-hyper 1.12.0, +1 more.The fingerprint page shows the full measured match list. More on the catalog.3
t13d3112h2_e8f1e7e78f70_b26ce05bbdd6 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.5.0, php-curl 7.88.1.The fingerprint page shows the full measured match list. More on the catalog.2
t13d4312h1_c7886603b240_b26ce05bbdd61
t13d3013h2_1d37bd780c83_8537cf56674e1
t13d2014h2_a09f3c656075_14788d8d241b1
t13d3013h1_1d37bd780c83_8537cf56674e1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn020000_5594a17e7e7e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0, curl 8.13.0, +11 more.The fingerprint page shows the full measured match list. More on the catalog.3
ge11nn040000_08e7224bf8c7_000000000000_0000000000003
ge20nr12trtr_54b4638ab28b_000000000000_0000000000003
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
ge11nn060000_6a46c5ae78e5_000000000000_0000000000001
ge20nr020000_b89ce445e0b3_000000000000_0000000000001
ge20nn13trtr_0c2c1d640f3e_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;4:6291456;6:262144|15663105|1:1:0:220|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chromium 149.0.7827.102, chrome 152.0.7977.83, +81 more.The fingerprint page shows the full measured match list. More on the catalog.3
3:100;4:10485760;2:0|1048510465|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0.The fingerprint page shows the full measured match list. More on the catalog.2
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
1:65536;2:0;4:6291456;6:262144|15663105|1:1:0:256|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chromium 131.0.6778.33, chromium 151.0.7922.34, chrome 151.0.7922.137, +57 more.The fingerprint page shows the full measured match list. More on the catalog.1
2:0;4:4194304;5:16384;6:262144;1:65536|1073741824|0|a,m,p,s1

TCP SYN (p0f)

fingerprintco-occurrences
4:43+21:0:1400:mss*44,10:mss,sok,ts,nop,ws:df,id+:04
4:41+23:0:1400:mss*44,10:mss,sok,ts,nop,ws:df,id+:02
4:42+22:0:1400:mss*44,10:mss,sok,ts,nop,ws:df,id+:02
4:54+10:0:1400:mss*44,10:mss,sok,ts,nop,ws:df,id+:01
4:48+16:0:1400:mss*44,10:mss,sok,ts,nop,ws:df,id+:01
4:46+18:0:1400:mss*44,10:mss,sok,ts,nop,ws:df,id+:01
4:51+13:0:1400:mss*44,10:mss,sok,ts,nop,ws:df,id+:01
4:40+24:0:1400:mss*44,10:mss,sok,ts,nop,ws:df,id+:01

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/151.0.0.0 Safari/537.364
NetworkDiagnostic/1.03
curl/8.5.02
python-requests/2.32.31
Go-http-client/2.01
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
curl/8.14.11

Country

fingerprintco-occurrences
TR · Turkey6
RU · Russia5
CA · Canada1
SA · Saudi Arabia1

Network (ASN)

fingerprintco-occurrences
AS8359 · MTS PJSC5
AS20978 · TT Mobil Iletisim Hizmetleri A.S4
AS12735 · TurkNet Iletisim Hizmetleri A.S.1
AS43766 · Mobile Telecommunication Company Saudi Arabia Joint-Stock company1
AS400724 · EZProvider Networks, Inc.1
AS51801 · INTERNET KUTUSU TELEKOMUNIKASYON BILISIM HIZMETLERI SANAYI VE TICARET LIMITED SIRKETI1

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.6