TCP SYN (JA4T)

43200_2-4-8-1-3_1440_9

first seen 2026-07-01 15:09 · last seen 2026-08-30 15:56 · JSON

Distinct clients per day (last 30 days, peak 3/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 window43200
Option kinds2-4-8-1-3
MSS1440
Window scale9

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
t13d131200_f57a46bbacb6_9249cab70c7734
t13d141000_cbb2034c60b8_e7c285222651 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.22.12.The fingerprint page shows the full measured match list. More on the catalog.3
t13d3013h2_1d37bd780c83_8537cf56674e3
t13d1713h1_ab0a1bf427ad_89ab6efea7732
t13d131100_f57a46bbacb6_e5728521abd41

HTTP request (JA4H)

fingerprintco-occurrences
ge11nr040000_e1d2031bdfea_000000000000_00000000000013
ge11nr05enus_f3bb7aa45ec4_000000000000_0000000000008
ge11nn040000_e1d2031bdfea_000000000000_0000000000007
ge11nn05enus_f3bb7aa45ec4_000000000000_0000000000003
ge11nr030000_cd680697de12_000000000000_0000000000003
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.3
po11nn060000_a35477c4bdb5_000000000000_0000000000002
po11nn090000_d19993cb819f_000000000000_0000000000002
ge11nn050000_ea6f06182064_000000000000_0000000000001
ge11nn06en00_98e697c2fa06_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
3:100;4:65536;2:0|1048510465|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, curl 8.18.0, curl 8.21.0, +7 more.The fingerprint page shows the full measured match list. More on the catalog.3

TCP SYN (p0f)

fingerprintco-occurrences
6:53+11:0:1440:mss*30,9:mss,sok,ts,nop,ws:flow:011
6:54+10:0:1440:mss*30,9:mss,sok,ts,nop,ws:flow:08
6:50+14:0:1440:mss*30,9:mss,sok,ts,nop,ws:flow:08
6:46+18:0:1440:mss*30,9:mss,sok,ts,nop,ws:flow:07
6:57+7:0:1440:mss*30,9:mss,sok,ts,nop,ws:flow:04
6:48+16:0:1440:mss*30,9:mss,sok,ts,nop,ws:flow:03
6:45+19:0:1440:mss*30,9:mss,sok,ts,nop,ws:flow:02

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.364
Mozilla/5.0 (X11; Linux x86_64; rv:150.0) Gecko/20100101 Firefox/150.04
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.36 Edg/146.0.0.03
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.363
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:150.0) Gecko/20100101 Firefox/150.03
curl/8.20.03
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/147.0.0.0 Safari/537.36 Edg/147.0.0.02
Mozilla/5.0 (iPhone; CPU iPhone OS 18_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.4 Mobile/15E148 Safari/604.12
TopicResearchCollector/0.1 (academic-topic-research)2
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/147.0.0.0 Safari/537.361

Country

fingerprintco-occurrences
US · United States28
DE · Germany10
FR · France3
JP · Japan2

Network (ASN)

fingerprintco-occurrences
AS22295 · Advin Services LLC27
AS206216 · Advin Services LLC7
AS16276 · OVH SAS3
AS393886 · Leaseweb USA, Inc.3
AS63949 · Akamai Connected Cloud2
AS53667 · FranTech Solutions1