TCP SYN (JA4T)

65535_2-4-8-1-3_1340_6

first seen 2026-07-23 17:25 · last seen 2026-09-05 04:43 · JSON

Distinct clients per day (last 30 days, peak 6/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
MSS1340
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
t13d4412h1_fd39b124ee10_58ed7828516f13
t13d1515h1_8daaf6152771_0a20fe35d3a510
t13d1515h1_8daaf6152771_de4a06bb82e37

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_00000000000010
ge11nn14enus_4a2973d235de_000000000000_0000000000007

TCP SYN (p0f)

fingerprintco-occurrences
4:48+16:0:1340:65535,6:mss,sok,ts,nop,ws:df,id+:06
4:44+20:0:1340:65535,6:mss,sok,ts,nop,ws:df,id+:06
4:47+17:0:1340:65535,6:mss,sok,ts,nop,ws:df,id+:05
4:46+18:0:1340:65535,6:mss,sok,ts,nop,ws:df,id+:03
4:54+10:0:1340:65535,6:mss,sok,ts,nop,ws:df,id+:02
4:49+15:0:1340:65535,6:mss,sok,ts,nop,ws:df,id+:02
4:45+19:0:1340:65535,6:mss,sok,ts,nop,ws:df,id+:01
4:43+21:0:1340:65535,6:mss,sok,ts,nop,ws:df,id+:01
4:52+12:0:1340:65535,6:mss,sok,ts,nop,ws:df,id+:01
4:41+23:0:1340:65535,6:mss,sok,ts,nop,ws::01

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.363
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.363
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/116.0.0.0 Safari/537.362
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.362
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 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 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.51 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.67 Safari/537.361

Country

fingerprintco-occurrences
JM · Jamaica6
PA · Panama4
IT · Italy3
EG · Egypt3
IQ · Iraq3
BD · Bangladesh2
BO · Bolivia2
GB · United Kingdom1
IN · India1
ES · Spain1

Network (ASN)

fingerprintco-occurrences
AS30689 · FLOW6
AS11556 · Cable & Wireless Panama4
AS8452 · TE-AS3
AS203214 · Hulum Almustakbal Company for Communication Engineering and Services Ltd2
AS28024 · Nuevatel PCS de Bolivia S.A.2
AS12874 · Fastweb SpA1
AS206067 · Hutchison 3G UK Limited1
AS24757 · Ethio Telecom1
AS1267 · WIND TRE S.P.A.1
AS200845 · AVATEL TELECOM, SA1