TCP SYN (p0f)

4:52+12:0:1460:mss*29,9:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-16 21:33 · last seen 2026-10-23 22:23 · 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 TTL52+12
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
t13d131000_f57a46bbacb6_e7c285222651 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.23.12.The fingerprint page shows the full measured match list. More on the catalog.39
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.4
t13d311200_e8f1e7e78f70_d339722ba4af4
t13d3112h1_e8f1e7e78f70_b26ce05bbdd6 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, +12 more.The fingerprint page shows the full measured match list. More on the catalog.4
t13d3013h2_1d37bd780c83_8537cf56674e2
t13d1516h2_8daaf6152771_e5627efa2ab11
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, +28 more.The fingerprint page shows the full measured match list. More on the catalog.1
t13d1310h2_ccf33812d0e6_5603904660151
t13d1011h2_9ebdff647648_9ced094328c91
t13d0711h2_8098ff52ee9c_9ced094328c91

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn05enus_813e32c09d15_000000000000_00000000000036
ge20nn04enus_989c7cc05c9b_000000000000_0000000000007
ge11nn06enus_3ce581af28ff_000000000000_0000000000004
ge11nn06enus_fb4afd1f380a_000000000000_0000000000004
ge11nn040000_88d30a62b7ad_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: wget 1.25.0.The fingerprint page shows the full measured match list. More on the catalog.3
ge11nn040000_8391bea91fb6_000000000000_0000000000003
ge20nn030000_bf75ddd0bb29_000000000000_0000000000002
ge11nr040000_8391bea91fb6_000000000000_0000000000001
ge20nn12enus_60f823d07c94_000000000000_0000000000001
ge20nn14ruru_1ea4ae3ab00a_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;4:6291456;6:262144;4:1048576|15663105|1:0:0:256|m,a,s,p7
3:100;4:65536;2:0|1048510465|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, curl 8.18.0, curl 8.21.0, +8 more.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, +57 more.The fingerprint page shows the full measured match list. More on the catalog.1
1:65536;3:1000;4:6291456;6:262144|15663105|1:1:0:256|m,a,s,p1

TCP SYN (JA4T)

fingerprintco-occurrences
42340_2-4-8-1-3_1460_923

User-Agent

fingerprintco-occurrences
Go-http-client/1.14
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.364
StartmeBot/1.0 (+https://start.me/bot)4
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/147.0.0.0 Safari/537.363
Mozilla/5.0 (iPhone; CPU iPhone OS 18_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.4 Mobile/15E148 Safari/604.13
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:150.0) Gecko/20100101 Firefox/150.03
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/147.0.0.0 Safari/537.36 Edg/147.0.0.02
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/147.0.0.0 Safari/537.362
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.362
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.4 Safari/605.1.152

Country

fingerprintco-occurrences
US · United States47
DE · Germany6
CH · Switzerland6
NL · Netherlands3

Network (ASN)

fingerprintco-occurrences
AS22295 · Advin Services LLC39
AS53667 · FranTech Solutions6
AS14061 · DigitalOcean, LLC4
AS212238 · Datacamp Limited4
AS14618 · Amazon.com, Inc.4
AS46475 · Limestone Networks, Inc.2
AS61125 · SABOTAGE LLC2
AS211955 · NOTBAD HOSTING LTD1

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 24.22.1, python-httpx 0.28.1, python-requests 2.34.2, +2 more.The fingerprint page shows the full measured match list. More on the catalog.2