TCP SYN (JA4T)

64240_2-4-8-1-3_1460_13

first seen 2026-07-02 02:20 · last seen 2026-09-16 08:51 · 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 window64240
Option kinds2-4-8-1-3
MSS1460
Window scale13

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
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.9
t13d1717h2_5b57614c22b0_3cbfd9057e0d Match?Exact match in Thumbprint's published controlled catalog captures: firefox 148.0.2, firefox 144.0.2, firefox 142.0.1, +6 more.The fingerprint page shows the full measured match list. More on the catalog.3
t13d2014h2_a09f3c656075_d0a99439f9b11
t13d1314h1_f57a46bbacb6_fb48f8b98a291
t13d2014h2_a09f3c656075_e42f34c56612 Match?Exact match in Thumbprint's published controlled catalog captures: safari 26.5.2, safari 26.5, urlsession 6.1.2, +1 more.The fingerprint page shows the full measured match list. More on the catalog.1
t13d1516h2_8daaf6152771_e5627efa2ab11

HTTP request (JA4H)

fingerprintco-occurrences
ge20nr13enus_6e14ebe6e21d_000000000000_0000000000004
ge20nn14enus_62292e79b603_000000000000_0000000000003
ge20nn11enus_3901d4197baf_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 152.0.5, firefox 153.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog.3
ge20nn15enus_81534b1c1f01_000000000000_0000000000002
ge20nn08enus_1945e0741196_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: safari 26.5.2, safari 26.4, safari 26.6.2.The fingerprint page shows the full measured match list. More on the catalog.2
ge11nr050000_a1c329e38462_000000000000_0000000000001
ge20nn13enus_1a3011f1c5bf_000000000000_0000000000001

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, +43 more.The fingerprint page shows the full measured match list. More on the catalog.5
1:65536;2:0;4:6291456;6:262144|15663105|1:1:0:220|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chromium 149.0.7827.102, chrome 149.0.7827.102, +59 more.The fingerprint page shows the full measured match list. More on the catalog.2
1:65536;2:0;4:131072;5:16384|12517377|1:0:0:42|m,p,a,s2
1:65536;2:0;4:131072;5:16384|12517377|1:0:0:256|m,p,a,s1
1:65536;2:0;4:6291456;6:262144|15663105|7:1:0:220|m,a,s,p1
1:65536;2:0;4:6291456;6:262144|15663105|9:1:7:220|m,a,s,p1
2:0;3:100;4:2097152;9:1|10420225|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: safari 26.5.2, safari 26.5, safari 26.4, +2 more.The fingerprint page shows the full measured match list. More on the catalog.1
2:0;3:100;4:2097152;8:1;9:1|10420225|1:0:0:256|m,s,a,p1
1:65536;3:1000;4:6291456;6:262144|15663105|1:1:0:256|m,a,s,p1

TCP SYN (p0f)

fingerprintco-occurrences
4:44+20:0:1460:mss*44,13:mss,sok,ts,nop,ws:df,id+:03
4:51+13:0:1460:mss*44,13:mss,sok,ts,nop,ws:df,id+:03
4:52+12:0:1460:mss*44,13:mss,sok,ts,nop,ws:df,id+:03
4:45+19:0:1460:mss*44,13:mss,sok,ts,nop,ws:df,id+:02
4:56+8:0:1460:mss*44,13:mss,sok,ts,nop,ws:df,id+:02
4:54+10:0:1460:mss*44,13:mss,sok,ts,nop,ws:df,id+:01
4:49+15:0:1460:mss*44,13:mss,sok,ts,nop,ws:df,id+:01
4:48+16:0:1460:mss*44,13: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/142.0.0.0 Safari/537.363
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.363
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.363
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:135.0) Gecko/20100101 Firefox/144.02
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.0 Safari/605.1.151
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.0 Safari/605.1.151
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:135.0) Gecko/20100101 Firefox/135.01
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.64 Safari/537.36 Edg/101.0.1210.471
Mozilla/5.0 (compatible; research-scan/1.0)1

Country

fingerprintco-occurrences
US · United States14
NL · Netherlands1
SG · Singapore1

Network (ASN)

fingerprintco-occurrences
AS14061 · DigitalOcean, LLC7
AS6939 · Hurricane Electric LLC6
AS45102 · Alibaba (US) Technology Co., Ltd.2
AS51396 · Pfcloud UG1