TCP SYN (JA4T)

14600_2-4-8-1-3_1460_7

first seen 2026-09-24 17:44 · last seen 2026-10-23 22:46 · JSON

Distinct clients per day (last 30 days, peak 27/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 window14600
Option kinds2-4-8-1-3
MSS1460
Window scale7

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
t13d3013h2_1d37bd780c83_8537cf56674e27
t13d4312h1_c7886603b240_b26ce05bbdd63
t13d1517h2_8daaf6152771_3cbfd9057e0d Match?Exact match in Thumbprint's published controlled catalog captures: firefox 155.0.1, firefox 154.0, firefox 156.0, +7 more.The fingerprint page shows the full measured match list. More on the catalog.1
t12d2808h1_d943125447b4_e0fb7d0a714d1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn030000_bf75ddd0bb29_000000000000_00000000000027
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.3
ge11nr06enus_a89d28968959_000000000000_0000000000001
ge20nn11ruru_3901d4197baf_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, +8 more.The fingerprint page shows the full measured match list. More on the catalog.27
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.1

TCP SYN (p0f)

fingerprintco-occurrences
4:54+10:0:1460:mss*10,7:mss,sok,ts,nop,ws:df,id+:021
4:48+16:0:1460:mss*10,7:mss,sok,ts,nop,ws:df,id+:03
4:47+17:0:1460:mss*10,7:mss,sok,ts,nop,ws:df,id+:02
4:45+19:0:1460:mss*10,7:mss,sok,ts,nop,ws:df,id+:02
4:50+14:0:1460:mss*10,7:mss,sok,ts,nop,ws:df,id+:01
4:46+18:0:1460:mss*10,7:mss,sok,ts,nop,ws:df,id+:01
4:41+23:0:1460:mss*10,7:mss,sok,ts,nop,ws:df,id+:01
4:49+15:0:1460:mss*10,7:mss,sok,ts,nop,ws:df,id+:01

User-Agent

fingerprintco-occurrences
curl/8.14.127
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.363
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:157.0) Gecko/20100101 Firefox/157.01
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:159.0) Gecko/20100101 Firefox/159.01

Country

fingerprintco-occurrences
IN · India21
ID · Indonesia3
FR · France2
PL · Poland2
SG · Singapore1
KH · Cambodia1
BD · Bangladesh1
EC · Ecuador1

Network (ASN)

fingerprintco-occurrences
AS132335 · LEAPSWITCH NETWORKS PRIVATE LIMITED21
AS200088 · Artnet Sp. z o.o.2
AS15557 · Societe Francaise Du Radiotelephone - SFR SA1
AS12322 · Free SAS1
AS4773 · MobileOne Ltd. Mobile/Internet Service Provider Singapore1
AS23688 · Link3 Technologies Ltd.1
AS24492 · WiCAM Corporation Ltd.1
AS150510 · PT Kawan Lama Sejahtera1
AS271967 · TURBONET S.A.1
AS142399 · PT Zona Kolektif Indonesia1

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 24.22.1, python-httpx 0.28.1, python-requests 2.34.2, +2 more.The fingerprint page shows the full measured match list. More on the catalog.27
001d,0017,001e,0019,0018,0100,0101,0102,0103,0104 Match?Exact match in Thumbprint's published controlled catalog captures: php-guzzle 8.3.1, curl 7.88.1, curl 8.13.0, +10 more.The fingerprint page shows the full measured match list. More on the catalog.2