TCP SYN (p0f)

4:113+15:0:1440:mss*44,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:0

first seen 2026-06-25 22:46 · last seen 2026-11-01 00:12 · JSON

Distinct clients per day (last 30 days, peak 1/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 TTL113+15
Options length0
MSS1440
Window sizemss*44
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
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.12
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.4
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.2
t13d1013h2_01be160bb49b_e24568c0d4401

HTTP request (JA4H)

fingerprintco-occurrences
ge11nr030000_cd680697de12_000000000000_0000000000002
ge20nn040000_272467e735d1_000000000000_0000000000002
he11nn030000_b0d6a43aa599_000000000000_0000000000002
ge11nr040000_bfb2fc23090b_000000000000_0000000000002
ge20nn040000_53ef267af07a_000000000000_0000000000002
ge20nn050000_162dbade507b_000000000000_0000000000001
ge20nn050000_c82176a97e8d_000000000000_0000000000001
ge20nn040000_4fc62b8ba0b7_000000000000_0000000000001
ge20nn040000_ac162d8a7b0c_000000000000_0000000000001
ge20nn040000_89d3fd0d6813_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.12
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.1

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-1-3-1-1-4_1440_816

User-Agent

fingerprintco-occurrences
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/116.0.1938.76 Safari/537.3612
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.363
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.74 Safari/537.36 Edg/79.0.309.432
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.361
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/136.0.0.0 Safari/537.361

Country

fingerprintco-occurrences
US · United States19

Network (ASN)

fingerprintco-occurrences
AS8075 · Microsoft Corporation19

TLS supported groups

fingerprintco-occurrences
0018,0017 Match?Exact match in Thumbprint's published controlled catalog captures: powershell 7.6.7, powershell 5.1.26100.33648, curl 8.21.0.The fingerprint page shows the full measured match list. More on the catalog.1