TCP SYN (p0f)

4:43+21:0:1312:65535,9:mss,sok,nop,nop,nop,nop,nop,nop,nop,nop,nop,nop,nop,ws::0

first seen 2026-07-25 02:50 · last seen 2026-09-04 17:11 · 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

IP version4
Initial TTL43+21
Options length0
MSS1312
Window size65535
Window scale9
Options layoutmss,sok,nop,nop,nop,nop,nop,nop,nop,nop,nop,nop,nop,ws
Payload class0

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
t13d4412h1_fd39b124ee10_58ed7828516f2
t13d1515h1_8daaf6152771_0a20fe35d3a51
t13d1515h1_8daaf6152771_de4a06bb82e31

HTTP request (JA4H)

fingerprintco-occurrences
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
ge11nn13enus_9db22d02e17a_000000000000_0000000000002

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-4-1-1-1-1-1-1-1-1-1-1-1-3_1312_94

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.54 Safari/537.361

Country

fingerprintco-occurrences
BD · Bangladesh4

Network (ASN)

fingerprintco-occurrences
AS24389 · GrameenPhone Ltd.4