TCP SYN (JA4T)

65535_2-4-8-1-3_1240_10

first seen 2026-07-01 14:34 · last seen 2026-10-31 18:01 · JSON

Last 7 days (2 observations)

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
MSS1240
Window scale10

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
t13d3113h2_e8f1e7e78f70_ce5650b735ce22
t13d4312h1_c7886603b240_b26ce05bbdd61

HTTP request (JA4H)

fingerprintco-occurrences
ge20cn04enus_91b626dfdddd_a9337a894088_83d3e9453f1522
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.1

HTTP/2 frames (Akamai)

fingerprintco-occurrences
3:100;4:33554432;2:0|33488897|0|m,p,s,a Match?Exact match in Thumbprint's published controlled catalog captures: php-curl 7.88.1, curl 7.88.1.The fingerprint page shows the full measured match list. More on the catalog.22

TCP SYN (p0f)

fingerprintco-occurrences
4:47+17:0:1240:65535,10:mss,sok,ts,nop,ws:df,id+:012
4:53+11:0:1240:65535,10:mss,sok,ts,nop,ws:df,id+:011

User-Agent

fingerprintco-occurrences
TelegramBot (like TwitterBot)22
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.361

Country

fingerprintco-occurrences
NL · Netherlands22
SG · Singapore1

Network (ASN)

fingerprintco-occurrences
AS62041 · Telegram Messenger Inc22
AS45143 · SINGTEL MOBILE INTERNET SERVICE PROVIDER Singapore1

TLS supported groups

fingerprintco-occurrences
001d,0017,001e,0019,00181
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.1