TCP SYN (p0f)

4:41+23:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-11 18:08 · last seen 2026-09-10 23:03 · JSON

Last 7 days (3 observations)

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 TTL41+23
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_58ed7828516f25
t13d4311h1_c7886603b240_7379471da27215
t13i170900_5b57614c22b0_78e6aca7449b5
t13d1515h1_8daaf6152771_0a20fe35d3a54
t13d131300_f57a46bbacb6_1bd98dace7753
t13d5911h1_a33745022dd6_1f22a2ca17c4 Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 23.11.1.The fingerprint page shows the full measured match list. More on the catalog.3
t13d1515h1_8daaf6152771_de4a06bb82e33
t13d151000_8daaf6152771_18e8a06d9b2d2
t13d311200_e8f1e7e78f70_d339722ba4af2
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.2

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.25
ge11nn07zhcn_ad6bb88d6320_000000000000_00000000000015
ge20nn04enus_989c7cc05c9b_000000000000_0000000000006
ge11nn13enus_9db22d02e17a_000000000000_0000000000005
ge11nn07*000_2f91038604b7_000000000000_0000000000003
ge11nn14enus_4a2973d235de_000000000000_0000000000003
ge11nn030000_0db47b7d240d_000000000000_0000000000002
ge11nn040000_80c20a6e2957_000000000000_0000000000002
ge11nr040000_e1d2031bdfea_000000000000_0000000000002
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.1

HTTP/2 frames (Akamai)

fingerprintco-occurrences
1:65536;2:0;4:6291456;6:262144;4:1048576|15663105|1:0:0:256|m,a,s,p6
2:0;4:2097152;5:16384;6:16384|5177345|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: rust-reqwest 0.13.4, rust-reqwest 0.12.28, rust-reqwest 0.13.5, +3 more.The fingerprint page shows the full measured match list. More on the catalog.1
1:65536;2:0;4:6291456;6:262144|15663105|0|m,a,s,p1
4:16777216|16711681|0|m,p,a,s1
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_773

User-Agent

fingerprintco-occurrences
Dalvik/2.1.0 (Linux; U; Android 9.0; ZTE BA520 Build/MRA58K)8
libredtail-http5
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11) AppleWebKit/601.1.27 (KHTML, like Gecko) Chrome/47.0.2526.106 Safari/601.1.274
Mozilla/5.0 (l9scan/2.0.430313e2739313e24393e23323; +https://leakix.net)3
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.362
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.362
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.362
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.362
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.362
Ruby2

Country

fingerprintco-occurrences
CN · China18
UZ · Uzbekistan16
AR · Argentina10
FI · Finland9
SG · Singapore6
CH · Switzerland6
BR · Brazil3
IL · Israel3
US · United States2
GB · United Kingdom2

Network (ASN)

fingerprintco-occurrences
AS4837 · CHINA UNICOM China169 Backbone15
AS24940 · Hetzner Online GmbH9
AS59668 · Turon Media XK8
AS211720 · Datashield, Inc.6
AS14061 · DigitalOcean, LLC5
AS202660 · Uzbektelekom Joint Stock Company4
AS12849 · Hot-Net internet services Ltd.3
AS7303 · Telecom Argentina S.A.3
AS27747 · Telecentro S.A.3
AS28126 · BRISANET SERVICOS DE TELECOMUNICACOES S.A3