TCP SYN (JA4T)

65535_2-1-3-4-8_1460_8

first seen 2026-07-01 14:32 · last seen 2026-09-08 15:59 · JSON

Distinct clients per day (last 30 days, peak 5/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 kinds2-1-3-4-8
MSS1460
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
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.24
t13d2913h1_723694b0fccc_5671b5df502919
t13d1410h2_f98f5dc5c741_8846e450cd955
t13d1617h2_86a278354501_3cbfd9057e0d Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 152.0.3, +10 more.The fingerprint page shows the full measured match list. More on the catalog.5
t13d301100_1d37bd780c83_8e6e362c5eac2
t13d2513h1_f5a23f7cfd7b_e24568c0d4402
t13d2512h1_f5a23f7cfd7b_36bf25f296df1
t13d1513h2_8daaf6152771_2abe4cb145371
t13d0710h2_9862da9c62ae_5603904660151
t13d1516h2_8daaf6152771_806a8c22fdea Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chrome 151.0.7922.137, chromium 151.0.7922.34, +24 more.The fingerprint page shows the full measured match list. More on the catalog.1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nr16ruru_94fdc06e0694_000000000000_0000000000006
ge11nr11ensg_835281d8e5d9_000000000000_0000000000006
ge20nr16enie_94fdc06e0694_000000000000_0000000000005
ge11nn030000_fe444ad14866_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.16.0.The fingerprint page shows the full measured match list. More on the catalog.3
ge20nr16nlnl_94fdc06e0694_000000000000_0000000000003
ge20nr13ruru_9e2b86631664_000000000000_0000000000003
ge11nr11enie_b350a6a7c155_000000000000_0000000000002
ge20nr13fr00_e4041ce921ac_000000000000_0000000000002
ge20nn16ruru_94fdc06e0694_000000000000_0000000000002
ge20nn16nlnl_94fdc06e0694_000000000000_0000000000002

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.24
1:4096;2:0;3:100;4:65535;5:16384|458751|0|m,a,s,p5
1:65536;2:0;4:131072;5:16384|12517377|3:0:0:42|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 152.0.5, firefox 152.0.1, +3 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.1
1:4096;2:1;4:16777216;6:16384|00|0|m,p,a,s1
1:65536;2:0;4:6291456;6:262144;4:1048576|15663105|1:0:0:256|m,a,s,p1

TCP SYN (p0f)

fingerprintco-occurrences
4:110+18:0:1460:65535,8:mss,nop,ws,sok,ts:df,id+,ecn:013
4:113+15:0:1460:65535,8:mss,nop,ws,sok,ts:df,id+:07
4:47+17:0:1460:65535,8:mss,nop,ws,sok,ts::05
4:50+14:0:1460:65535,8:mss,nop,ws,sok,ts:df,id+:05
4:112+16:0:1460:65535,8:mss,nop,ws,sok,ts:df,id+:05
4:117+11:0:1460:65535,8:mss,nop,ws,sok,ts:df,id+:05
4:48+16:0:1460:65535,8:mss,nop,ws,sok,ts:df,id+:04
4:38+26:0:1460:65535,8:mss,nop,ws,sok,ts:df,id+:03
4:107+21:0:1460:65535,8:mss,nop,ws,sok,ts:df,id+:03
4:112+16:0:1460:65535,8:mss,nop,ws,sok,ts:df,id+,ecn:02

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.36 Edg/150.0.0.05
Mozilla/5.0 (Linux; Android 13; 2211133C) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Mobile Safari/537.364
curl/8.19.03
Mozilla/5.0 (iPad; CPU OS 17_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.5 Mobile/15E148 Safari/604.13
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.36 OPR/135.0.0.03
Mozilla/5.0 (Linux; Android 14; Pixel 9) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Mobile Safari/537.36 OPR/135.0.0.03
Mozilla/5.0 (iPad; CPU OS 17_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.4 Mobile/15E148 Safari/604.13
Mozilla/5.0 (iPhone; CPU iPhone OS 17_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.2 Mobile/15E148 Safari/604.12
Mozilla/5.0 (X11; Linux x86_64; rv:153.0) Gecko/20100101 Firefox/153.02
Mozilla/5.0 (Android 13; Mobile; rv:153.0) Gecko/153.0 Firefox/153.02

Country

fingerprintco-occurrences
RU · Russia21
SG · Singapore15
IE · Ireland11
NL · Netherlands5
FR · France5
US · United States3
NO · Norway1
UA · Ukraine1

Network (ASN)

fingerprintco-occurrences
AS4773 · MobileOne Ltd. Mobile/Internet Service Provider Singapore12
AS41230 · ASK4 Limited11
AS12389 · PJSC Rostelecom5
AS15557 · Societe Francaise Du Radiotelephone - SFR SA5
AS1136 · KPN B.V.5
AS8402 · PJSC "Vimpelcom"4
AS34602 · MEGASVYAZ LLC3
AS9506 · Singtel Fibre Broadband3
AS25513 · PJSC Moscow city telephone network2
AS34757 · Sibirskie Seti Ltd.2

Cross-transport links

TLS ClientHello fingerprints observed from the same client via the beacon's correlation id on the other transport (e.g. this stack over TCP ↔ that stack over QUIC).

fingerprintlinked observations
q13d0311h3_55b375c5d22e_653d80c3fe9d1