TCP SYN (JA4T)

64240_2-4-8-1-3_1396_9

first seen 2026-10-03 09:54 · last seen 2026-10-28 07:27 · JSON

Last 7 days (6 observations)

Distinct clients per day (last 30 days, peak 6/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 window64240
Option kinds2-4-8-1-3
MSS1396
Window scale9

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
t13d161100_1711a4c0508c_b26ce05bbdd67
t13d151200_8daaf6152771_8537cf56674e3
t13d151200_8daaf6152771_ecd0401ec68b2

HTTP request (JA4H)

fingerprintco-occurrences
ge11nr14enus_aae5a9e05461_000000000000_0000000000008
ge11nn17enus_b9f9c3fe64f4_000000000000_0000000000002
ge11nn15enus_6a531caba9b4_000000000000_0000000000002

TCP SYN (p0f)

fingerprintco-occurrences
4:47+17:0:1396:mss*44,9:mss,sok,ts,nop,ws:df,id+,ecn:012

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/148.0.0.0 Safari/537.3610
curl/7.88.12

Country

fingerprintco-occurrences
US · United States12

Network (ASN)

fingerprintco-occurrences
AS7941 · Internet Archive12

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: 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.4
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.2