TCP SYN (p0f)

4:50+14:0:1380:65535,13:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-21 16:33 · last seen 2026-10-23 22:40 · JSON

Distinct clients per day (last 30 days, peak 40/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 TTL50+14
Options length0
MSS1380
Window size65535
Window scale13
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
t13d3013h2_1d37bd780c83_8537cf56674e Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.18.0.The fingerprint page shows the full measured match list. More on the catalog.40
t13d1011h1_61a7ad8aa9b6_3a8073edd8ef7
t12d180700_4b22cbed5bed_2dae41c691ec2
t13d1812h1_85036bcba153_b26ce05bbdd61

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn030000_bf75ddd0bb29_000000000000_00000000000040
ge11nn040000_cf1edba2959c_000000000000_0000000000002
ge11nn11enus_1fab05156ead_000000000000_0000000000002
ge11nn040000_608e01151bf4_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: python-requests 2.32.3.The fingerprint page shows the full measured match list. More on the catalog.1
ge11nr06enus_85f58504866d_000000000000_0000000000001
ge11nr13enus_ed40770a2e50_000000000000_0000000000001
ge11nr10enus_e297311195fc_000000000000_0000000000001
ge11nn13enus_ed40770a2e50_000000000000_0000000000001
ge11nn06enus_85f58504866d_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.40

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-4-8-1-3_1380_1347

User-Agent

fingerprintco-occurrences
curl/8.14.140
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.362
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.362
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:137.0) Gecko/20100101 Firefox/137.02
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; rv:143.0) Gecko/20100101 Firefox/143.01
Mozilla/5.0 (Linux; Android 15; Pixel 9) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Mobile Safari/537.361
Mozilla/5.0 (Linux; Android 14; Pixel 8) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.6422.113 Mobile Safari/537.361

Country

fingerprintco-occurrences
FI · Finland9
NL · Netherlands8
FR · France7
RU · Russia7
UA · Ukraine3
SG · Singapore2
BG · Bulgaria2
DE · Germany1
US · United States1
NO · Norway1

Network (ASN)

fingerprintco-occurrences
AS13335 · Cloudflare, Inc.50

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: python-httpx 0.28.1, python-requests 2.34.2, curl 8.23.0, +4 more.The fingerprint page shows the full measured match list. More on the catalog.40