TCP SYN (p0f)

4:40+24:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-11 05:26 · last seen 2026-09-15 02:54 · JSON

Last 7 days (2 observations)

Distinct clients per day (last 30 days, peak 4/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 TTL40+24
Options length0
MSS1460
Window sizemss*44
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
t13d4412h1_fd39b124ee10_58ed7828516f10
t13d1515h1_8daaf6152771_0a20fe35d3a54
t13i170900_5b57614c22b0_78e6aca7449b3
t13d131300_f57a46bbacb6_1bd98dace7753
t13d251100_b78ed14e2fd0_ab7e3b40a6773
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
t12d130600_2d7513195f68_e51b7354d87f1
t13d301300_1d37bd780c83_c5cfab342c591
t13d131100_f57a46bbacb6_e5728521abd41
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.1

HTTP request (JA4H)

fingerprintco-occurrences
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.10
ge20nn04enus_989c7cc05c9b_000000000000_0000000000005
ge11nn050000_57c5e92682a8_000000000000_0000000000003
ge11nn14enus_4a2973d235de_000000000000_0000000000002
ge11nn13enus_9db22d02e17a_000000000000_0000000000002
ge11nn030000_0db47b7d240d_000000000000_0000000000001
ge11nn05enus_813e32c09d15_000000000000_0000000000001
ge20nn12zhcn_3b263d8a4b60_000000000000_0000000000001
po11nn060000_ed383ed8462e_000000000000_0000000000001
po11nn060000_8c1b2e3f6532_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,p5
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, +43 more.The fingerprint page shows the full measured match list. More on the catalog.2
1:65536;2:0;4:131072;5:16384|12517377|3:0:0:42|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 152.0.5, firefox 152.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog.1

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_726

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (l9scan/2.0.430313e2739313e24393e23323; +https://leakix.net)4
libredtail-http3
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.3 Safari/537.363
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.361
Mozilla/5.0 (X11; Linux x86_64; rv:149.0) Gecko/20100101 Firefox/149.01
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.361
Mozilla/5.0 (compatible)1
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36 Edg/131.0.0.01

Country

fingerprintco-occurrences
SG · Singapore5
RO · Romania5
AR · Argentina5
PL · Poland3
CN · China3
VE · Venezuela3
ID · Indonesia2
UZ · Uzbekistan2
US · United States1
BR · Brazil1

Network (ASN)

fingerprintco-occurrences
AS14061 · DigitalOcean, LLC5
AS200651 · FlokiNET ehf5
AS16276 · OVH SAS4
AS264628 · CORPORACION FIBEX TELECOM, C.A.3
AS27747 · Telecentro S.A.2
AS59668 · Turon Media XK2
AS138115 · PT Deneva2
AS212317 · Hetzner Online GmbH1
AS55990 · Huawei Cloud Service data center1
AS137718 · Beijing Volcano Engine Technology Co., Ltd.1