TCP SYN (JA4T)

29200_2-4-8-1-3_1460_3

first seen 2026-07-08 11:18 · last seen 2026-10-17 21:35 · JSON

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 window29200
Option kinds2-4-8-1-3
MSS1460
Window scale3

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
t13d2013h1_2b729b4bf6f3_e24568c0d4404
t13d3112h2_e8f1e7e78f70_b26ce05bbdd6 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.5.0, php-curl 7.88.1.The fingerprint page shows the full measured match list. More on the catalog.3
t13d1610h1_1711a4c0508c_147b4839f6f53
t13d4312h1_c7886603b240_b26ce05bbdd62

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn030000_fe444ad14866_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.16.0, curl 7.88.1, curl 8.21.0, +1 more.The fingerprint page shows the full measured match list. More on the catalog.4
ge20nn020000_5594a17e7e7e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0, curl 8.13.0, +11 more.The fingerprint page shows the full measured match list. More on the catalog.3
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.2
ge11nr14ko00_3db8af7c5dd9_000000000000_0000000000002
ge11nn15ko00_d29420ce31fc_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
3:100;4:10485760;2:0|1048510465|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0.The fingerprint page shows the full measured match list. More on the catalog.3

TCP SYN (p0f)

fingerprintco-occurrences
4:42+22:0:1460:mss*20,3:mss,sok,ts,nop,ws:df,id+:03
4:52+12:0:1460:mss*20,3:mss,sok,ts,nop,ws:df,id+:01
4:51+13:0:1460:mss*20,3:mss,sok,ts,nop,ws:df,id+:01
4:50+14:0:1460:mss*20,3:mss,sok,ts,nop,ws:df,id+:01
4:250+5:0:1460:mss*20,3:mss,sok,ts,nop,ws:df,id+:01
4:48+16:0:1460:mss*20,3:mss,sok,ts,nop,ws:df,id+:01
4:47+17:0:1460:mss*20,3:mss,sok,ts,nop,ws:df,id+:01
4:53+11:0:1460:mss*20,3:mss,sok,ts,nop,ws:df,id+:01
4:44+20:0:1460:mss*20,3:mss,sok,ts,nop,ws:df,id+:01
4:43+21:0:1460:mss*20,3:mss,sok,ts,nop,ws:df,id+:01

User-Agent

fingerprintco-occurrences
curl/8.21.04
curl/8.5.03
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.36 Edg/150.0.0.03
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.361

Country

fingerprintco-occurrences
US · United States7
KR · South Korea3
GB · United Kingdom2

Network (ASN)

fingerprintco-occurrences
AS7922 · Comcast Cable Communications, LLC3
AS4668 · LG CNS3
AS7018 · AT&T Enterprises, LLC2
AS43915 · TrueSpeed Communications Limited2
AS11427 · Charter Communications Inc1
AS30432 · STRATA NETWORKS1

TLS supported groups

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