TCP SYN (JA4T)

65535_2-4-8-1-3_1320_8

first seen 2026-07-26 09:00 · last seen 2026-10-28 06:02 · JSON

Last 7 days (2 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
MSS1320
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
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
t13d1515h1_8daaf6152771_de4a06bb82e32
t13d4412h1_fd39b124ee10_58ed7828516f2
t13d4312h1_c7886603b240_b26ce05bbdd61

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.3
ge11nn13enus_9db22d02e17a_000000000000_0000000000002
ge11nr19zhtw_4e9b73ab7510_000000000000_0000000000001
ge11nr18engb_45ed06ef2081_000000000000_0000000000001

TCP SYN (p0f)

fingerprintco-occurrences
4:47+17:0:1320:65535,8:mss,sok,ts,nop,ws:df,id+:02
4:42+22:0:1320:65535,8:mss,sok,ts,nop,ws:df,id+:01
4:51+13:0:1320:65535,8:mss,sok,ts,nop,ws:df,id+:01
4:39+25:0:1320:65535,8:mss,sok,ts,nop,ws::01
4:56+8:0:1320:65535,8:mss,sok,ts,nop,ws:df,id+:01
4:49+15:0:1320:65535,8: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/121.0.0.0 Safari/537.36 Edg/121.0.0.02
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 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 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/90.0.4430.85 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.51 Safari/537.361

Country

fingerprintco-occurrences
BD · Bangladesh2
NL · Netherlands1
GB · United Kingdom1
RU · Russia1
UA · Ukraine1
EG · Egypt1

Network (ASN)

fingerprintco-occurrences
AS63023 · GTHost1
AS8452 · TE-AS1
AS134599 · Digital Dot Net (DDN)1
AS25133 · LLC "McLaut-Invest"1
AS138612 · AMR NET1
AS15774 · Limited Liability Company TTK-Svyaz1
AS25135 · Vodafone Limited1

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 158.0.1, firefox 157.0, firefox 157.0.1, +5 more.The fingerprint page shows the full measured match list. More on the catalog.2
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.1