TCP SYN (p0f)

4:109+19:0:1460:62727,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-07-01 14:38 · last seen 2026-09-04 12:30 · 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 TTL109+19
Options length0
MSS1460
Window size62727
Window scale7
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
t13d1312h2_f57a46bbacb6_ab7e3b40a677 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.8, go-net/http 1.26.7, +5 more.The fingerprint page shows the full measured match list. More on the catalog.3
t13d491100_834380eab35e_d41ae481755e2
t13d521100_b262b3658495_8e6e362c5eac1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nr15enus_74b4d49d6d21_000000000000_0000000000001
ge11nr07enus_313799b1302d_000000000000_0000000000001
ge20nr15enus_5603a9d4b77e_000000000000_0000000000001
he11nr07enus_313799b1302d_000000000000_0000000000001
ge20nr15enus_9bd4b1ac845b_000000000000_0000000000001
ge11nn13enus_e9b608609477_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
2:0;4:4194304;5:16384;6:10485760|1073741824|0|a,m,p,s Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.8, go-net/http 1.26.7, +6 more.The fingerprint page shows the full measured match list. More on the catalog.3

TCP SYN (JA4T)

fingerprintco-occurrences
62727_2-4-8-1-3_1460_76

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (compatible; FacebookExternalHit/1.1; +http://www.facebook.com/externalhit_uatext.php)3
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.362
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.107 Safari/537.361

Country

fingerprintco-occurrences
DE · Germany5
IE · Ireland1

Network (ASN)

fingerprintco-occurrences
AS16509 · Amazon.com, Inc.6