TCP SYN (p0f)

4:44+20:0:1460:mss*44,9:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-23 11:50 · last seen 2026-08-23 16:18 · 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 TTL44+20
Options length0
MSS1460
Window sizemss*44
Window scale9
Options layoutmss,sok,ts,nop,ws
Quirksdf,id+
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
t13i1811h1_85036bcba153_d41ae481755e1
t13d3112h1_e8f1e7e78f70_d41ae481755e1

HTTP request (JA4H)

fingerprintco-occurrences
he11nn040000_88d30a62b7ad_000000000000_0000000000001
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

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_91

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.361
Mozilla/5.0 (compatible; osentix-crawler/1.0; +https://osentix.com/bot)1

Country

fingerprintco-occurrences
CN · China1
FI · Finland1

Network (ASN)

fingerprintco-occurrences
AS4134 · CHINANET BACKBONE1
AS24940 · Hetzner Online GmbH1