TCP SYN (JA4T)

65535_2-4-8-1-3_1220_6

first seen 2026-07-23 21:01 · last seen 2026-10-31 18:12 · JSON

Last 7 days (12 observations)

Distinct clients per day (last 30 days, peak 8/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
MSS1220
Window scale6

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
t13d4312h1_c7886603b240_b26ce05bbdd657
t13d4412h1_fd39b124ee10_58ed7828516f6
t13d1516h2_8daaf6152771_d8a2da3f94cd Match?Exact match in Thumbprint's published controlled catalog captures: chromium 149.0.7827.102, chrome 149.0.7827.102, chrome 149.0.7827.156, +25 more.The fingerprint page shows the full measured match list. More on the catalog.4
t13d1515h1_8daaf6152771_de4a06bb82e34
t13d1516h1_8daaf6152771_1a63afa7c4782
t13d1516h2_8daaf6152771_02713d6af862 Match?Exact match in Thumbprint's published controlled catalog captures: chromium 131.0.6778.33, chromium 134.0.6998.35, chromium 133.0.6943.16.The fingerprint page shows the full measured match list. More on the catalog.1
t13d1515h1_8daaf6152771_0a20fe35d3a51
t13d2812h2_257f3020b3a2_cbb9361b6bf91

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.63
ge11nn13enus_9db22d02e17a_000000000000_0000000000007
ge20nn13enus_0c2c1d640f3e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 151.0.7922.137, chrome 151.0.7922.170, chrome 151.0.7922.108, +39 more.The fingerprint page shows the full measured match list. More on the catalog.4
ge20nn12enus_60f823d07c94_000000000000_0000000000001
ge20nn020000_b89ce445e0b3_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.21.13, go-net/http 1.27.1, go-net/http 1.27.3, +14 more.The fingerprint page shows the full measured match list. More on the catalog.1

HTTP/2 frames (Akamai)

fingerprintco-occurrences
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, +60 more.The fingerprint page shows the full measured match list. More on the catalog.5
1:65536;2:0;4:6291456;6:262144|15663105|1:0:0:256|m,a,s,p1

TCP SYN (p0f)

fingerprintco-occurrences
4:42+22:0:1220:65535,6:mss,sok,ts,nop,ws:df,id+:08
4:44+20:0:1220:65535,6:mss,sok,ts,nop,ws:df,id+:07
6:48+16:0:1220:65535,6:mss,sok,ts,nop,ws:flow:06
4:48+16:0:1220:65535,6:mss,sok,ts,nop,ws:df,id+:05
6:51+13:0:1220:65535,6:mss,sok,ts,nop,ws:flow:05
6:44+20:0:1220:65535,6:mss,sok,ts,nop,ws:flow:05
6:45+19:0:1220:65535,6:mss,sok,ts,nop,ws:flow:05
6:40+24:0:1220:65535,6:mss,sok,ts,nop,ws:flow:05
6:43+21:0:1220:65535,6:mss,sok,ts,nop,ws:flow:04
6:47+17:0:1220:65535,6:mss,sok,ts,nop,ws:flow:04

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.3610
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.369
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.369
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.369
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.367
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.366
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.365
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.364
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.363
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.51 Safari/537.362

Country

fingerprintco-occurrences
SA · Saudi Arabia35
KE · Kenya19
BR · Brazil4
PL · Poland4
IT · Italy4
US · United States2
IN · India2
ID · Indonesia1
UA · Ukraine1
TW · Taiwan1

Network (ASN)

fingerprintco-occurrences
AS39891 · Saudi Telecom Company JSC22
AS328331 · POA INTERNET KENYA LIMITED19
AS35819 · Etihad Etisalat, a joint stock company13
AS5617 · Orange Polska Spolka Akcyjna4
AS12874 · Fastweb SpA4
AS18881 · TELEFÔNICA BRASIL S.A3
AS45271 · Vodafone Idea Ltd2
AS212238 · Datacamp Limited1
AS7922 · Comcast Cable Communications, LLC1
AS27699 · TELEFÔNICA BRASIL S.A1

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.45
0a0a,11ec,001d,0017,0018 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 156.0.8078.48, edge 155.0.4283.62, chrome 156.0.8078.47, +11 more.The fingerprint page shows the full measured match list. More on the catalog.3
0a0a,001d,0017,00181