TCP SYN (p0f)

4:41+23:0:1400:65535,8:mss,sok,nop,nop,nop,ws:df,id+:0

first seen 2026-10-28 08:42 · last seen 2026-10-28 08:42 · 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 TTL41+23
Options length0
MSS1400
Window size65535
Window scale8
Options layoutmss,sok,nop,nop,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
t13d131100_f57a46bbacb6_ab7e3b40a677 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.5, go-net/http 1.26.4.The fingerprint page shows the full measured match list. More on the catalog.1

HTTP request (JA4H)

fingerprintco-occurrences
ge11nr15enus_944d72baa157_000000000000_0000000000001

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-4-1-1-1-3_1400_81

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (X11; Linux x86_64; rv:127.0) Gecko/20100101 Firefox/127.01

Country

fingerprintco-occurrences
PK · Pakistan1

Network (ASN)

fingerprintco-occurrences
AS59257 · CMPak Limited1

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 157.0.1, firefox-esr 153.5.1esr, firefox 158.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog.1