TCP SYN (p0f)

4:44+20:0:1400:mss*20,4:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-10-27 18:59 · last seen 2026-10-27 18:59 · JSON

Last 7 days (2 observations)

Distinct clients per day (last 30 days, peak 2/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
MSS1400
Window sizemss*20
Window scale4
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
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.2

HTTP request (JA4H)

fingerprintco-occurrences
ge11nr19zhtw_4e9b73ab7510_000000000000_0000000000001
ge11nr15enus_944d72baa157_000000000000_0000000000001

TCP SYN (JA4T)

fingerprintco-occurrences
29200_2-4-8-1-3_1400_42

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:128.0) Gecko/20100101 Firefox/128.01
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.6167.57 Safari/537.361

Country

fingerprintco-occurrences
RO · Romania1
BG · Bulgaria1

Network (ASN)

fingerprintco-occurrences
AS8708 · DIGI ROMANIA S.A.1
AS12716 · A1 Bulgaria EAD1

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 158.0.1, firefox 157.0, firefox 157.0.1, +5 more.The fingerprint page shows the full measured match list. More on the catalog.2