TCP SYN (p0f)

6:46+18:0:1440:mss*30,9:mss,sok,ts,nop,ws:flow:0

first seen 2026-06-26 03:44 · last seen 2026-10-30 14:04 · JSON

Last 7 days (15 observations)

Distinct clients per day (last 30 days, peak 5/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 TTL46+18
Options length0
MSS1440
Window sizemss*30
Window scale9
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
t13d3515h1_8f004308c246_5c2c66f702b053
t13d131200_f57a46bbacb6_9249cab70c777
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.1
t13d3013h2_1d37bd780c83_8537cf56674e1

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn050000_a1c329e38462_000000000000_00000000000043
ge11nn050000_3658ef221638_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: wget 1.21.4, wget 1.25.0, wget 1.21.3.The fingerprint page shows the full measured match list. More on the catalog.10
ge11nn040000_e1d2031bdfea_000000000000_0000000000002
po11nn060000_a35477c4bdb5_000000000000_0000000000002
po11nn090000_d19993cb819f_000000000000_0000000000002
he20nn030000_c0d7f5f1a627_000000000000_0000000000001
ge11nn05enus_f3bb7aa45ec4_000000000000_0000000000001
ge20nn030000_bf75ddd0bb29_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
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.1
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.1

TCP SYN (JA4T)

fingerprintco-occurrences
43200_2-4-8-1-3_1440_961

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (compatible; Infrawatch/1.0; +https://infrawat.ch/)41
Mozilla/5.012
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/147.0.0.0 Safari/537.361
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:150.0) Gecko/20100101 Firefox/150.01
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; ChatGPT-User/1.0; +https://openai.com/bot1
facebookexternalhit/1.1 (+http://www.facebook.com/externalhit_uatext.php)1
keycdn-tools/speed1
curl/8.14.11
meta-externalagent/1.1 (+https://developers.facebook.com/docs/sharing/webmasters/crawler)1

Country

fingerprintco-occurrences
DE · Germany51
NL · Netherlands11

Network (ASN)

fingerprintco-occurrences
AS25369 · Hydra Communications Ltd53
AS206216 · Advin Services LLC7
AS63949 · Akamai Connected Cloud1
AS44239 · proinity GmbH1

TLS supported groups

fingerprintco-occurrences
001d,0017,0018,0019,0100,010138
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.1