TCP SYN (JA4T)

65535_2-4-8-1-3_1412_11

first seen 2026-09-27 03:54 · last seen 2026-10-23 22:06 · 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 window65535
Option kinds2-4-8-1-3
MSS1412
Window scale11

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.3
t13d3113h1_e8f1e7e78f70_d339722ba4af2
t13d2712h2_b4f9224df7c1_cbb9361b6bf92
t13d2014h2_a09f3c656075_e42f34c56612 Match?Exact match in Thumbprint's published controlled catalog captures: safari 26.5.2, safari 26.5, safari 26.6.1, +1 more.The fingerprint page shows the full measured match list. More on the catalog.1
t13d3013h2_1d37bd780c83_8537cf56674e1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn030000_afa057d9a858_000000000000_0000000000005
ge11nn050000_ea6f06182064_000000000000_0000000000002
ge20nn030000_ff50983941c1_000000000000_0000000000001
ge20nn030000_bf75ddd0bb29_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, +57 more.The fingerprint page shows the full measured match list. More on the catalog.3
1:65536;2:0;4:6291456;6:262144;4:1048576|15663105|1:0:0:256|m,a,s,p2
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.1
2:0;3:100;4:2097152;9:1|10420225|1:0:0:256|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: safari 26.5.2.The fingerprint page shows the full measured match list. More on the catalog.1

TCP SYN (p0f)

fingerprintco-occurrences
4:54+10:0:1412:65535,11:mss,sok,ts,nop,ws:df,id+:03
4:55+9:0:1412:65535,11:mss,sok,ts,nop,ws:df,id+:03
4:53+11:0:1412:65535,11:mss,sok,ts,nop,ws:df,id+:02
4:45+19:0:1412:65535,11:mss,sok,ts,nop,ws:df,id+:01

User-Agent

fingerprintco-occurrences
GlassloomTLSAudit/1.08
curl/8.14.11

Country

fingerprintco-occurrences
US · United States8
HK · Hong Kong SAR China1

Network (ASN)

fingerprintco-occurrences
AS2914 · NTT America, Inc.8
AS135377 · UCLOUD INFORMATION TECHNOLOGY (HK) LIMITED1

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.1