TCP SYN (p0f)

4:50+14:0:1460:mss*20,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-11 11:27 · last seen 2026-10-28 07:27 · JSON

Last 7 days (1 observations)

Distinct clients per day (last 30 days, peak 59/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
MSS1460
Window sizemss*20
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
t13d3013h2_1d37bd780c83_8537cf56674e59
t13i170900_5b57614c22b0_78e6aca7449b2
t12d130600_2d7513195f68_e51b7354d87f2
t13d4312h1_c7886603b240_b26ce05bbdd61
t13d1011h1_61a7ad8aa9b6_3a8073edd8ef1
t13i250900_b78ed14e2fd0_e7c2852226511
t13d521100_b262b3658495_8e6e362c5eac1
t13d3612h1_018971650b2c_58ed7828516f1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn030000_bf75ddd0bb29_000000000000_00000000000059
ge11nr040000_e1d2031bdfea_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
po11nn050000_b4ba55311b46_000000000000_0000000000001
ge11nr040000_cf1edba2959c_000000000000_0000000000001
ge11nn070000_d0d63ed74832_000000000000_0000000000001
ge11nn050000_c71bbc472f37_000000000000_0000000000001
ge11nn07engb_71b742b5154a_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.59

TCP SYN (JA4T)

fingerprintco-occurrences
29200_2-4-8-1-3_1460_767

User-Agent

fingerprintco-occurrences
curl/8.14.159
libredtail-http2
Mozilla/5.0 (Linux; Android 11; M2004J15SC) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.5060.114 Mobile Safari/537.362
Mozilla/5.0 (SS; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.361
Mozilla/5.0 (compatible; The Lounge IRC Client; +https://github.com/thelounge/thelounge) facebookexternalhit/1.1 Twitterbot/1.01
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.107 Safari/537.361

Country

fingerprintco-occurrences
BR · Brazil38
ES · Spain9
DK · Denmark9
US · United States3
BG · Bulgaria2
IE · Ireland2
LY · Libya2
AU · Australia1
FR · France1
TW · Taiwan1

Network (ASN)

fingerprintco-occurrences
AS262287 · Latitude.sh LTDA38
AS9009 · M247 Europe SRL11
AS8560 · IONOS SE9
AS50360 · Tamatiya EOOD2
AS45102 · Alibaba (US) Technology Co., Ltd.2
AS37284 · Aljeel Aljadeed For Technology2
AS15557 · Societe Francaise Du Radiotelephone - SFR SA1
AS3462 · Data Communication Business Group1
AS1221 · Telstra Limited1
AS31863 · Centrilogic, Inc.1

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.60