TCP SYN (JA4T)

65535_2-4-8-1-3_1388_8

first seen 2026-07-23 20:08 · last seen 2026-09-01 07:38 · JSON

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
MSS1388
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
t13d4412h1_fd39b124ee10_58ed7828516f6
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.4
t13d1515h1_8daaf6152771_de4a06bb82e33
t13d2013h1_2b729b4bf6f3_e24568c0d4401
t13d1515h1_8daaf6152771_0a20fe35d3a51

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
ge20nn020000_5594a17e7e7e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0, curl 8.18.0, +9 more.The fingerprint page shows the full measured match list. More on the catalog.4
ge11nn13enus_9db22d02e17a_000000000000_0000000000003
ge11nn030000_fe444ad14866_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.16.0.The fingerprint page shows the full measured match list. More on the catalog.1
ge11nn14enus_4a2973d235de_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
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.4

TCP SYN (p0f)

fingerprintco-occurrences
4:44+20:0:1388:65535,8:mss,sok,ts,nop,ws:df,id+:06
4:47+17:0:1388:65535,8:mss,sok,ts,nop,ws:df,id+:04
4:45+19:0:1388:65535,8:mss,sok,ts,nop,ws:df,id+:03
4:43+21:0:1388:65535,8:mss,sok,ts,nop,ws:df,id+:01
4:50+14:0:1388:65535,8:mss,sok,ts,nop,ws:df,id+:01

User-Agent

fingerprintco-occurrences
curl/8.5.04
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.362
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.67 Safari/537.362
curl/8.21.01
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_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Brave Chrome/86.0.4240.75 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.81 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 11_2_1) AppleWebKit/537.36 (KHTML, like Gecko) Brave Chrome/89.0.4389.90 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/537.36 (KHTML, like Gecko) Brave Chrome/78.0.3904.87 Safari/537.361

Country

fingerprintco-occurrences
PK · Pakistan6
US · United States5
BD · Bangladesh1
JO · Jordan1
DZ · Algeria1
DO · Dominican Republic1

Network (ASN)

fingerprintco-occurrences
AS6167 · Verizon Business5
AS45669 · PMCL /LDI IP TRANSIT3
AS59257 · CMPak Limited3
AS48832 · Jordanian mobile phone services Ltd1
AS6400 · Compañía Dominicana de Teléfonos S. A.1
AS24432 · TM International Bangladesh Ltd.Internet service Provider,Gulshan-1,Dhaka-12121
AS33779 · Wataniya Telecom Algerie1