TCP SYN (p0f)

4:56+8:0:1460:mss*29,12:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-25 14:22 · last seen 2026-10-27 19:06 · JSON

Last 7 days (4 observations)

Distinct clients per day (last 30 days, peak 11/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 TTL56+8
Options length0
MSS1460
Window sizemss*29
Window scale12
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
t12d280900_0df5e5c63df4_5c2ba267272491
t13d190900_9dc949149365_97f8aa674fd990
t13d131000_f57a46bbacb6_e7c285222651 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.23.12.The fingerprint page shows the full measured match list. More on the catalog.74
t13d251100_b78ed14e2fd0_ab7e3b40a67726
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.19
t13d181100_85036bcba153_d41ae481755e13
t13d3013h2_1d37bd780c83_8537cf56674e11
t13d1414h2_cbb2034c60b8_1bd98dace77510
t13d1312h1_f57a46bbacb6_ab7e3b40a67710
t13d151100_8daaf6152771_ab7e3b40a6775

HTTP request (JA4H)

fingerprintco-occurrences
ge10nr040000_532a1ee47909_000000000000_00000000000091
ge11nr11enus_d756a6a6873f_000000000000_00000000000060
ge11nn050000_57c5e92682a8_000000000000_00000000000043
ge11nr030000_cd680697de12_000000000000_00000000000040
ge11nn030000_cd680697de12_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: powershell 7.6.6, powershell 7.6.5, powershell 7.6.4, +11 more.The fingerprint page shows the full measured match list. More on the catalog.27
ge20nn030000_bf75ddd0bb29_000000000000_00000000000011
ge11nr050000_57c5e92682a8_000000000000_0000000000009
ge11nr040000_8391bea91fb6_000000000000_0000000000008
ge11nr05enus_f3bb7aa45ec4_000000000000_0000000000005
ge11nn030000_0db47b7d240d_000000000000_0000000000004

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.11
2:0;4:4194304;5:16384;6:10485760|1073741824|0|a,m,p,s Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.10, go-net/http 1.26.9, +8 more.The fingerprint page shows the full measured match list. More on the catalog.10
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, +57 more.The fingerprint page shows the full measured match list. More on the catalog.1
2:0;4:4194304;6:10485760|1073741824|0|a,m,p,s Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.21.13, go-net/http 1.23.12.The fingerprint page shows the full measured match list. More on the catalog.1
2:0;4:2097152;3:100;9:1|10485760|0|m,s,p,a1

TCP SYN (JA4T)

fingerprintco-occurrences
42340_2-4-8-1-3_1460_12288

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.3691
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.3622
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:133.0) Gecko/20100101 Firefox/133.021
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.3621
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.3620
curl/8.14.111
TLM-Audit-Scanner/1.010
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.368
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.368
Mozilla/5.05

Country

fingerprintco-occurrences
NL · Netherlands345
US · United States7
CA · Canada7
HK · Hong Kong SAR China1

Network (ASN)

fingerprintco-occurrences
AS48090 · TECHOFF SRV LIMITED241
AS211486 · Alferov Aleksey Aleksandrovich37
AS205997 · Vlad Cojuhari28
AS213474 · HomeLine Broadband LLC25
AS213388 · IIC RAIL LIMITED8
AS11878 · tzulo, inc.5
AS212238 · Datacamp Limited4
AS9009 · M247 Europe SRL3
AS202412 · Omegatech LTD3
AS11404 · Wave Broadband2

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.11
11ec,11eb,11ed,001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.27.3, go-net/http 1.26.10.The fingerprint page shows the full measured match list. More on the catalog.3
001d,0017,001e,0019,0018,0100,0101,0102,0103,0104 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, php-guzzle 8.3.1, curl 7.88.1, +10 more.The fingerprint page shows the full measured match list. More on the catalog.2
0a0a,11ec,001d,0017,0018 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 155.0.8059.40, chrome 156.0.8078.73, chromium 156.0.8078.47, +8 more.The fingerprint page shows the full measured match list. More on the catalog.1