TCP SYN (p0f)

4:56+8:0:1460:mss*44,13:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-08-23 15:39 · last seen 2026-09-11 07:56 · 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 TTL56+8
Options length0
MSS1460
Window sizemss*44
Window scale13
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
t13d1314h1_f57a46bbacb6_fb48f8b98a291
t13d2014h2_a09f3c656075_e42f34c56612 Match?Exact match in Thumbprint's published controlled catalog captures: safari 26.5.2, safari 26.5, urlsession 6.1.2, +1 more.The fingerprint page shows the full measured match list. More on the catalog.1

HTTP request (JA4H)

fingerprintco-occurrences
ge11nr050000_a1c329e38462_000000000000_0000000000001
ge20nn08enus_1945e0741196_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: safari 26.5.2, safari 26.4, safari 26.6.2.The fingerprint page shows the full measured match list. More on the catalog.1

HTTP/2 frames (Akamai)

fingerprintco-occurrences
2:0;3:100;4:2097152;8:1;9:1|10420225|1:0:0:256|m,s,a,p1

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_132

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (compatible; research-scan/1.0)1
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.0 Safari/605.1.151

Country

fingerprintco-occurrences
NL · Netherlands1
US · United States1

Network (ASN)

fingerprintco-occurrences
AS51396 · Pfcloud UG1
AS14061 · DigitalOcean, LLC1