TCP SYN (p0f)

4:110+18:0:1440:65535,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:0

first seen 2026-06-12 06:19 · last seen 2026-10-13 20:52 · JSON

Distinct clients per day (last 30 days, peak 3/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 TTL110+18
Options length0
MSS1440
Window size65535
Window scale8
Options layoutmss,nop,ws,nop,nop,sok
Quirksdf,id+,ecn
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
t13d2013h2_2b729b4bf6f3_e24568c0d440 Match?Exact match in Thumbprint's published controlled catalog captures: winhttp 10.0.20348.1.The fingerprint page shows the full measured match list. More on the catalog.3
t13d1013h2_01be160bb49b_e24568c0d4403
t13d2212h2_231e334592e8_36bf25f296df Match?Exact match in Thumbprint's published controlled catalog captures: powershell 7.6.6, powershell 7.6.9, powershell 7.6.8.The fingerprint page shows the full measured match list. More on the catalog.2
t13d2013h1_2b729b4bf6f3_e24568c0d4401
t13d101100_01be160bb49b_36bf25f296df Match?Exact match in Thumbprint's published controlled catalog captures: powershell 7.6.6, powershell 7.6.5, powershell 5.1.26100.33296, +8 more.The fingerprint page shows the full measured match list. More on the catalog.1
t13d1012h2_01be160bb49b_36bf25f296df1
t13d2012h2_2b729b4bf6f3_36bf25f296df1
t13d2213h2_231e334592e8_e24568c0d4401

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn000000_000000000000_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: rust-hyper 1.11.1, rust-hyper 1.12.0, rust-hyper 1.11.0, +1 more.The fingerprint page shows the full measured match list. More on the catalog.4
ge20nn020000_9b3c08a48073_000000000000_0000000000004
ge20nn020000_fb4f949fd323_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: powershell 7.6.6, powershell 7.6.9, powershell 7.6.8.The fingerprint page shows the full measured match list. More on the catalog.2
ge20nn010000_a510e5066512_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: java-httpclient 17.0.19, java-httpclient 11.0.31, winhttp 10.0.20348.1, +10 more.The fingerprint page shows the full measured match list. More on the catalog.1
ge11nn030000_fe444ad14866_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.16.0, curl 7.88.1, curl 8.21.0, +1 more.The fingerprint page shows the full measured match list. More on the catalog.1
ge11nn07en00_806ad52065dd_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
2:0;4:65535|67043329|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: powershell 7.6.6, powershell 7.6.9, powershell 7.6.8.The fingerprint page shows the full measured match list. More on the catalog.6
2:0;4:10485760|10420225|0|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: winhttp 10.0.20348.1.The fingerprint page shows the full measured match list. More on the catalog.4
2:0;4:10485760|33488897|0|m,p,a,s1

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-1-3-1-1-4_1440_813

User-Agent

fingerprintco-occurrences
schannel-defaults-experiment5
Mozilla/5.0 (Windows NT 10.0; Microsoft Windows 10.0.26100; en-US) PowerShell/7.6.62
Mozilla/5.0 (Windows NT 6.1; WOW64) SkypeUriPreview Preview/0.5 skype-url-preview@microsoft.com1
curl/8.16.01

Country

fingerprintco-occurrences
US · United States12
FR · France1

Network (ASN)

fingerprintco-occurrences
AS8075 · Microsoft Corporation13