TCP SYN (p0f)

4:45+19:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-11 07:20 · last seen 2026-09-16 02:13 · JSON

Last 7 days (76 observations)

Distinct clients per day (last 30 days, peak 23/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 TTL45+19
Options length0
MSS1460
Window sizemss*44
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
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.74
t13d4412h1_fd39b124ee10_58ed7828516f66
t13d1515h1_8daaf6152771_de4a06bb82e335
t13d1515h1_8daaf6152771_0a20fe35d3a518
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.12
t13d251100_b78ed14e2fd0_ab7e3b40a67711
t13d3112h2_e8f1e7e78f70_b26ce05bbdd6 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.5.0, php-curl 7.88.1.The fingerprint page shows the full measured match list. More on the catalog.9
t13d311200_e8f1e7e78f70_ccd0985badbe6
t13d491200_bd868743f55c_7c76daad20ec5
t13i1909h1_9dc949149365_97f8aa674fd94

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn13enus_0c2c1d640f3e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 151.0.7922.137, chrome 151.0.7922.170, chrome 151.0.7922.108, +23 more.The fingerprint page shows the full measured match list. More on the catalog.74
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.66
ge11nn13enus_9db22d02e17a_000000000000_00000000000047
ge20nn04enus_989c7cc05c9b_000000000000_00000000000024
ge20nn020000_5594a17e7e7e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0, curl 8.18.0, +9 more.The fingerprint page shows the full measured match list. More on the catalog.12
ge20nn11enus_dbdd560af68b_000000000000_00000000000010
ge11nn14enus_4a2973d235de_000000000000_00000000000010
ge11nn04enus_171d872ea17d_000000000000_0000000000006
ge11nr040000_88d30a62b7ad_000000000000_0000000000005
po11nn050000_b4ba55311b46_000000000000_0000000000005

HTTP/2 frames (Akamai)

fingerprintco-occurrences
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.76
1:65536;2:0;4:6291456;6:262144;4:1048576|15663105|1:0:0:256|m,a,s,p24
1:65536;2:0;4:6291456;6:262144|15663105|1:1:0:220|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chromium 149.0.7827.102, chrome 149.0.7827.102, +59 more.The fingerprint page shows the full measured match list. More on the catalog.11
3:100;4:10485760;2:0|1048510465|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0.The fingerprint page shows the full measured match list. More on the catalog.9
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;3:1000;4:6291456|15663105|1:1:0:256|m,a,s,p2
3:100;4:1073741824;2:0|1073676289|0|m,p,s,a2
1:65536;2:0;3:1000;4:6291456;6:262144|15663105|1:1:0:256|m,a,s,p1
1:65536;3:1000;4:6291456;6:262144|15663105|1:1:0:256|m,a,s,p1
4:4194304;3:100|10485760|1:0:0:255|m,s,p,a1

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_7281

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.3674
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.3610
curl/8.5.09
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.369
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.368
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.51 Safari/537.368
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:134.0) Gecko/20100101 Firefox/134.06
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.366
libredtail-http4
Mozilla/5.0 (compatible; GenomeCrawlerd/1.0; +https://www.nokia.com/genomecrawler)4

Country

fingerprintco-occurrences
US · United States62
DE · Germany21
FR · France19
UA · Ukraine17
CO · Colombia16
ID · Indonesia11
HU · Hungary11
IL · Israel11
MX · Mexico10
EC · Ecuador10

Network (ASN)

fingerprintco-occurrences
AS64249 · Charles River Operation34
AS9009 · M247 Europe SRL24
AS58087 · Florian Kolb18
AS24940 · Hetzner Online GmbH11
AS55688 · PT. Beon Intermedia11
AS35758 · Rachamim Aviel Twito11
AS14638 · Liberty Communications of Puerto Rico LLC9
AS12874 · Fastweb SpA8
AS13489 · UNE EPM TELECOMUNICACIONES S.A.8
AS213412 · ONYPHE SAS6