TCP SYN (JA4T)

65535_2-4-8-1-3_1436_8

first seen 2026-07-24 03:40 · last seen 2026-10-30 18:21 · JSON

Last 7 days (3 observations)

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
MSS1436
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_58ed7828516f9
t13d4312h1_c7886603b240_b26ce05bbdd64
t13d1515h1_8daaf6152771_de4a06bb82e34
t13d1515h1_8daaf6152771_0a20fe35d3a53
t13d131100_f57a46bbacb6_ab7e3b40a677 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.5, go-net/http 1.26.4.The fingerprint page shows the full measured match list. More on the catalog.2
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
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.13
ge11nn13enus_9db22d02e17a_000000000000_0000000000006
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.2
ge11nn14enus_4a2973d235de_000000000000_0000000000002
ge11nr19zhcn_4e9b73ab7510_000000000000_0000000000001
ge11nr17engb_021c223ca66c_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.2

TCP SYN (p0f)

fingerprintco-occurrences
4:45+19:0:1436:65535,8:mss,sok,ts,nop,ws:df,id+:05
4:43+21:0:1436:65535,8:mss,sok,ts,nop,ws:df,id+:04
4:44+20:0:1436:65535,8:mss,sok,ts,nop,ws:df,id+:03
4:41+23:0:1436:65535,8:mss,sok,ts,nop,ws:df,id+:03
4:49+15:0:1436:65535,8:mss,sok,ts,nop,ws:df,id+:03
4:52+12:0:1436:65535,8:mss,sok,ts,nop,ws:df,id+:02
4:46+18:0:1436:65535,8:mss,sok,ts,nop,ws:df,id+:02
4:42+22:0:1436:65535,8:mss,sok,ts,nop,ws:df,id+:01
4:51+13:0:1436:65535,8:mss,sok,ts,nop,ws:df,id+:01
4:47+17:0:1436:65535,8: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/124.0.0.0 Safari/537.362
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.362
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.362
curl/8.5.02
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 (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/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/605.1.15 (KHTML, like Gecko) Version/17.2 Safari/605.1.151
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 Edg/120.0.0.01

Country

fingerprintco-occurrences
UZ · Uzbekistan9
US · United States6
BD · Bangladesh2
PK · Pakistan2
VI · U.S. Virgin Islands2
UA · Ukraine1
TT · Trinidad & Tobago1
AR · Argentina1
DO · Dominican Republic1

Network (ASN)

fingerprintco-occurrences
AS8193 · "Uzbektelekom" Joint Stock Company9
AS13428 · Surf Air Wireless, LLC3
AS11492 · CABLE ONE, INC.3
AS136525 · Wancom (Pvt) Ltd.2
AS14434 · VI POWERNET, LLC2
AS59362 · KS Network Limited1
AS27924 · AMPLIA COMMUNICATIONS LTD.1
AS27983 · Red Intercable Digital S.A.1
AS27887 · WIND Telecom S.A.1
AS137823 · cloudone1

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.4
11ec,001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 157.0.1, firefox-esr 153.5.1esr, firefox 158.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog.2