TCP SYN (p0f)

4:117+11:0:1460:mss*29,13:mss,nop,nop,sok,nop,ws:df,id+:0

first seen 2026-09-14 02:19 · last seen 2026-10-27 16:43 · JSON

Last 7 days (1 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

IP version4
Initial TTL117+11
Options length0
MSS1460
Window sizemss*29
Window scale13
Options layoutmss,nop,nop,sok,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
t13d181000_e8a523a41297_78e6aca7449b2
t13d1713h1_ab0a1bf427ad_ecd0401ec68b Match?Exact match in Thumbprint's published controlled catalog captures: python-httpx 0.28.1.The fingerprint page shows the full measured match list. More on the catalog.1

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn040000_487c3246ac94_000000000000_0000000000002
ge11nn050000_be0d0b335e46_000000000000_0000000000001

TCP SYN (JA4T)

fingerprintco-occurrences
42340_2-1-1-4-1-3_1460_133

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36 Edg/115.0.1901.2032
Mozilla/5.0 (X11; Linux x86_64; rv:125.0) Gecko/20100101 Firefox/125.01

Country

fingerprintco-occurrences
US · United States1
SE · Sweden1
FI · Finland1

Network (ASN)

fingerprintco-occurrences
AS213954 · Global Transit Systems LLC2
AS59651 · AS QualityNetwork1

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: python-httpx 0.28.1, python-requests 2.34.2, curl 8.23.0, +4 more.The fingerprint page shows the full measured match list. More on the catalog.1