TCP SYN (p0f)

4:55+9:0:1460:mss*29,9:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-11 08:43 · last seen 2026-09-01 02:25 · JSON

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 TTL55+9
Options length0
MSS1460
Window sizemss*29
Window scale9
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
t13d151100_8daaf6152771_ab7e3b40a677132
t13d1312h1_f57a46bbacb6_ab7e3b40a67733
t13d311200_e8f1e7e78f70_d339722ba4af30
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.7
t13d1011h1_61a7ad8aa9b6_3a8073edd8ef1
t13d1516h2_8daaf6152771_806a8c22fdea Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chrome 151.0.7922.137, chromium 151.0.7922.34, +24 more.The fingerprint page shows the full measured match list. More on the catalog.1
t13d1011h2_8f6131ea19bd_9ced094328c91
t13d0911h2_280b03476222_9ced094328c91

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn06enus_3ce581af28ff_000000000000_00000000000027
ge11nr39enus_1c19b8b5959c_000000000000_00000000000011
ge11nr37enus_4fc02c8dab26_000000000000_0000000000007
ge11nr41enus_fd8eed19052c_000000000000_0000000000007
ge11nr39enus_8275968c859c_000000000000_0000000000007
ge11nr38enus_c9f28418db6b_000000000000_0000000000007
ge11nr40enus_4d2a4bd3cdc8_000000000000_0000000000006
ge11nr41enus_c0fe3e80018a_000000000000_0000000000006
ge11nr38enus_423680453bc1_000000000000_0000000000006
ge11nr05enus_900748f1e0f3_000000000000_0000000000006

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;4:6291456;6:262144;4:1048576|15663105|1:0:0:256|m,a,s,p2
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
42340_2-4-8-1-3_1460_9202

User-Agent

fingerprintco-occurrences
StartmeBot/1.0 (+https://start.me/bot)30
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.3621
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.3613
Mozilla/5.0 (X11; Linux x86_64; rv:127.0) Gecko/20100101 Firefox/127.09
Mozilla/5.0 (Macintosh; Intel Mac OS X 14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.369
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.368
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.367
Mozilla/5.0 (Macintosh; Intel Mac OS X 14_5) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.5 Safari/605.1.157
Mozilla/5.0 (Linux; Android 14; SM-S918B Build/UP1A.231005.007) AppleWebKit/537.36 (KHTML, like Gecko) SamsungBrowser/25.0 Chrome/121.0.0.0 Mobile Safari/537.367
Mozilla/5.0 (Linux; Android 14; Pixel 8 Pro) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Mobile Safari/537.367

Country

fingerprintco-occurrences
US · United States171
SE · Sweden31
GB · United Kingdom2
PL · Poland2

Network (ASN)

fingerprintco-occurrences
AS142430 · DIGI VPS81
AS150303 · SoloRDP60
AS203861 · Miteflux Technologies Ltd31
AS14618 · Amazon.com, Inc.30
AS48031 · Ivanov Vitaliy Sergeevich2
AS399486 · 12651980 CANADA INC.1
AS198983 · Joseph Hofmann trading as 'Tornado Datacenter GmbH & Co. KG'1