TCP SYN (p0f)

6:43+21:0:1440:mss*45,7:mss,sok,ts,nop,ws:flow:0

first seen 2026-06-27 03:28 · last seen 2026-08-22 20:17 · 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 version6
Initial TTL43+21
Options length0
MSS1440
Window sizemss*45
Window scale7
Options layoutmss,sok,ts,nop,ws
Quirksflow
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
t13d301000_1d37bd780c83_3550537cd59b656
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.3
t13d521100_b262b3658495_8e6e362c5eac3
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.3
t12d290700_fc2078a0b8c0_8c06664c3ac52
t13d3112h1_e8f1e7e78f70_b26ce05bbdd6 Match?Exact match in Thumbprint's published controlled catalog captures: php-guzzle 8.1.0, php-guzzle 8.0.2, php-guzzle 7.14.2, +6 more.The fingerprint page shows the full measured match list. More on the catalog.2
t13d3113h2_e8f1e7e78f70_ce5650b735ce2
t13d1717h2_5b57614c22b0_3cbfd9057e0d Match?Exact match in Thumbprint's published controlled catalog captures: firefox 148.0.2, firefox 144.0.2, firefox 142.0.1, +6 more.The fingerprint page shows the full measured match list. More on the catalog.2
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.1
t13d1812h1_85036bcba153_b26ce05bbdd61

HTTP request (JA4H)

fingerprintco-occurrences
ge11nr08enus_002f1ef91713_000000000000_000000000000656
ge11nn050000_2469c960a647_000000000000_0000000000003
ge11nn040000_7f23123e2a6a_000000000000_0000000000003
ge20nn030000_ff50983941c1_000000000000_0000000000002
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.2
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.2
ge20nn11enus_3901d4197baf_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 152.0.5, firefox 153.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog.2
ge11nr030000_0db47b7d240d_000000000000_0000000000001
he20nn06enus_43e672cad96b_000000000000_0000000000001
he11nn070000_998adb423cf4_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
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.3
3:100;4:1073741824;2:0|1073676289|0|m,p,s,a2
1:65536;2:0;4:131072;5:16384|12517377|1:0:0:42|m,p,a,s2
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.1

TCP SYN (JA4T)

fingerprintco-occurrences
64800_2-4-8-1-3_1440_7677

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36656
Mozilla/5.03
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.33
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Safari/537.36 Edg/91.0.864.542
Mozilla/5.0 (compatible; MJ12bot/v1.4.8; http://mj12bot.com/)2
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Bravebot/1.0; +https://search.brave.com/help/brave-search-crawler) Chrome/W.X.Y.Z Safari/537.362
curl/8.5.02
Go-http-client/1.11
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:152.0) Gecko/20100101 Firefox/152.01
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:74.0) Gecko/20100101 Firefox/74.01

Country

fingerprintco-occurrences
FR · France663
FI · Finland6
DE · Germany3
IN · India3
US · United States2
RO · Romania1

Network (ASN)

fingerprintco-occurrences
AS51167 · Contabo GmbH661
AS24940 · Hetzner Online GmbH9
AS47583 · Hostinger International Limited3
AS16276 · OVH SAS2
AS7922 · Comcast Cable Communications, LLC2
AS50190 · HOSTINGBIT SRL1