TCP SYN (p0f)

4:56+8:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-11 07:17 · last seen 2026-09-16 14:24 · JSON

Last 7 days (88 observations)

Distinct clients per day (last 30 days, peak 28/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 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_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.818
t13d3515h1_8f004308c246_5c2c66f702b0109
t13d3113h1_e8f1e7e78f70_ce5650b735ce Match?Exact match in Thumbprint's published controlled catalog captures: php-guzzle 8.2.0, php-guzzle 8.1.0, php-guzzle 8.0.2, +2 more.The fingerprint page shows the full measured match list. More on the catalog.78
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.72
t13d1011h1_61a7ad8aa9b6_3a8073edd8ef27
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.11
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.11
t13d1517h2_8daaf6152771_dcad5a05399110
t12i570500_2a2bed94251f_a1e93568279510
t13d301300_1d37bd780c83_5ae85263eb3b10

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn11enus_dbdd560af68b_000000000000_000000000000798
ge11nn020000_818f42cc3fd7_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: php-guzzle 8.1.0, php-guzzle 8.2.0, php-guzzle 8.0.2, +7 more.The fingerprint page shows the full measured match list. More on the catalog.78
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.66
ge11nn050000_a1c329e38462_000000000000_00000000000059
po11nn080000_86f5668e3d93_000000000000_00000000000052
ge20nn04enus_989c7cc05c9b_000000000000_00000000000020
ge11nn15enus_42d7418375b7_000000000000_00000000000010
ge11nr040000_cf1edba2959c_000000000000_0000000000009
ge10nr040000_532a1ee47909_000000000000_0000000000007
ge11nn040000_cf1edba2959c_000000000000_0000000000007

HTTP/2 frames (Akamai)

fingerprintco-occurrences
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.817
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,p20
2:0;3:100;4:2097152;9:1|10420225|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: safari 26.5.2, safari 26.5, safari 26.4, +2 more.The fingerprint page shows the full measured match list. More on the catalog.13
1:65536;2:0;4:6291456;6:262144|15663105|0|m,a,s,p9
2:0;4:4194304;6:10485760|1073741824|0|a,m,p,s Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.21.13, go-net/http 1.23.12.The fingerprint page shows the full measured match list. More on the catalog.5
1:65536;2:0;4:6291456;6:262144|15663105|3:1:0:220|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chromium 151.0.7922.34, chromium 147.0.7727.15, chromium 145.0.7632.6, +21 more.The fingerprint page shows the full measured match list. More on the catalog.4
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.4
1:65536;2:0;4:6291456;6:262144|15663105|5:1:0:220|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chromium 133.0.6943.16, chrome 150.0.7871.128, chromium 148.0.7778.96, +2 more.The fingerprint page shows the full measured match list. More on the catalog.2
1:65536;2:0;4:131072;5:16384|12517377|3:0:0:22|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 154.0, +25 more.The fingerprint page shows the full measured match list. More on the catalog.2

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_71256

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36790
Mozilla/5.0 (compatible; Infrawatch/1.0; +https://infrawat.ch/)109
GuzzleHttp/778
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.3669
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.3616
Mozilla/5.0 (compatible; jscrawler/0.1; +https://github.com/)12
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.2 Safari/605.1.1511
Mozilla/5.0 (compatible; GitFinder/1.0)11
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.3610
Mozilla/5.0 (X11; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.09

Country

fingerprintco-occurrences
US · United States884
GB · United Kingdom256
NL · Netherlands73
DE · Germany36
FR · France5
ES · Spain4
KR · South Korea3
CA · Canada2
BE · Belgium1
PA · Panama1

Network (ASN)

fingerprintco-occurrences
AS3257 · GTT Communications Inc.535
AS212286 · LonConnect Ltd141
AS25369 · Hydra Communications Ltd109
AS14061 · DigitalOcean, LLC97
AS55286 · B2 Net Solutions Inc.75
AS30058 · FDCservers.net54
AS208137 · Feo Prest SRL22
AS212238 · Datacamp Limited19
AS210906 · UAB Bite Lietuva19
AS40662 · Layer7 Technologies Inc16

Cross-transport links

TLS ClientHello fingerprints observed from the same client via the beacon's correlation id on the other transport (e.g. this stack over TCP ↔ that stack over QUIC).

fingerprintlinked observations
q13d0311h3_55b375c5d22e_653d80c3fe9d1
q13d0312h3_55b375c5d22e_178839b6cec11