TCP SYN (p0f)

4:56+8:0:1460:65535,10:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-16 17:56 · last seen 2026-09-01 02:20 · 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 TTL56+8
Options length0
MSS1460
Window size65535
Window scale10
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
t13d1813h1_85036bcba153_d339722ba4af2
t13d3113h2_e8f1e7e78f70_ce5650b735ce2
t13d181100_85036bcba153_d41ae481755e2
t13d311000_e8f1e7e78f70_518fb456ca591
t13d1516h2_8daaf6152771_d8a2da3f94cd Match?Exact match in Thumbprint's published controlled catalog captures: chromium 149.0.7827.102, chrome 149.0.7827.102, chrome 149.0.7827.156, +25 more.The fingerprint page shows the full measured match list. More on the catalog.1
t12d280900_0df5e5c63df4_5c2ba26727241
t13d4412h1_fd39b124ee10_58ed7828516f1
t13d5212h1_b262b3658495_8e6e362c5eac Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 24.19.0, node-fetch 22.23.1, node-fetch 24.21.0, +6 more.The fingerprint page shows the full measured match list. More on the catalog.1
t13d1515h1_8daaf6152771_de4a06bb82e31
t13d1714h1_5b57614c22b0_43ade6aba3df1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nr05enus_d0c4616abeb5_000000000000_0000000000002
ge11nn06enus_78e1fd2a069b_000000000000_0000000000002
ge11nr050000_ea6f06182064_000000000000_0000000000002
ge11nr09enus_dc2e78bcf96c_000000000000_0000000000001
ge20nn10enus_f7ad313dcc59_000000000000_0000000000001
ge10nr040000_532a1ee47909_000000000000_0000000000001
ge11nn050000_b223a0ebb0b5_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: python-requests 2.34.2, python-requests 2.33.1, python-requests 2.32.3.The fingerprint page shows the full measured match list. More on the catalog.1
ge11nn10enus_8bb9e66c760b_000000000000_0000000000001
ge11nn13enus_9db22d02e17a_000000000000_0000000000001
ge11nn05enus_6c708d44224e_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
3:100;4:33554432;2:0|33488897|0|m,p,s,a Match?Exact match in Thumbprint's published controlled catalog captures: php-curl 7.88.1.The fingerprint page shows the full measured match list. More on the catalog.2
1:65536;2:0;4:6291456;6:262144|15663105|1:1:0:256|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chromium 131.0.6778.33, chromium 151.0.7922.34, chrome 151.0.7922.137, +43 more.The fingerprint page shows the full measured match list. More on the catalog.1

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-4-8-1-3_1460_1012

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:49.0) Gecko/20100101 Firefox/49.0 (FlipboardProxy/1.2; +http://flipboard.com/browserproxy)2
Mozilla/5.0 (compatible; FlipboardProxy/1.2; +http://flipboard.com/browserproxy)2
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.361
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.0.0 Safari/537.361
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 6.2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.361
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.361

Country

fingerprintco-occurrences
US · United States7
DE · Germany3
GB · United Kingdom1
ES · Spain1
CA · Canada1

Network (ASN)

fingerprintco-occurrences
AS14618 · Amazon.com, Inc.4
AS62240 · Clouvider2
AS28753 · Leaseweb Deutschland GmbH2
AS64080 · SYN LTD1
AS202496 · trafficforce, UAB1
AS63018 · Dedicated.com1
AS9009 · M247 Europe SRL1
AS197173 · HIGHLIGHT APPS LTD1