TCP SYN (JA4T)

65535_2-4-8-1-3_1452_2

first seen 2026-08-03 17:54 · last seen 2026-10-10 12:21 · JSON

Distinct clients per day (last 30 days, peak 2/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
MSS1452
Window scale2

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_e24568c0d4409
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.2

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.9
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.2

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.2

TCP SYN (p0f)

fingerprintco-occurrences
4:49+15:0:1452:65535,2:mss,sok,ts,nop,ws:df,id+:04
4:51+13:0:1452:65535,2:mss,sok,ts,nop,ws:df,id+:02
4:50+14:0:1452:65535,2:mss,sok,ts,nop,ws:df,id+:02
4:46+18:0:1452:65535,2:mss,sok,ts,nop,ws:df,id+:02
4:48+16:0:1452:65535,2:mss,sok,ts,nop,ws:df,id+:01

User-Agent

fingerprintco-occurrences
curl/8.21.09
curl/8.5.02

Country

fingerprintco-occurrences
US · United States11

Network (ASN)

fingerprintco-occurrences
AS7871 · SEI Data, Inc.3
AS13977 · Fidium2
AS11427 · Charter Communications Inc1
AS701 · Verizon Business1
AS209 · CenturyLink Communications, LLC1
AS19201 · Eastex Telephone Cooperative, Inc.1
AS14155 · Rural Telephone Service Co, Inc.1
AS53848 · Mountain Telephone1