TCP SYN (p0f)

4:45+19:0:1460:mss*20,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-12 07:13 · last seen 2026-10-24 20:40 · JSON

Distinct clients per day (last 30 days, peak 15/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 TTL45+19
Options length0
MSS1460
Window sizemss*20
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
t13d1516h2_8daaf6152771_806a8c22fdea Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chrome 151.0.7922.137, chromium 151.0.7922.34, +28 more.The fingerprint page shows the full measured match list. More on the catalog.293
t12d990700_a40d17a72bcb_4446390ac22421
t13d3013h2_1d37bd780c83_8537cf56674e Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.18.0.The fingerprint page shows the full measured match list. More on the catalog.16
t12d490600_730fb1b0ac6a_a1e93568279511
t13d191000_9dc949149365_e7c28522265110
t12i130500_2d7513195f68_e51b7354d87f3
t13d4312h1_c7886603b240_b26ce05bbdd63
t13d1516h2_8daaf6152771_d8a2da3f94cd Match?Exact match in Thumbprint's published controlled catalog captures: chromium 149.0.7827.102, chrome 149.0.7827.102, chrome 149.0.7827.156, +25 more.The fingerprint page shows the full measured match list. More on the catalog.1
t13i131000_f57a46bbacb6_ab7e3b40a6771
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.1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn13enus_0c2c1d640f3e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 151.0.7922.137, chrome 151.0.7922.170, chrome 151.0.7922.108, +39 more.The fingerprint page shows the full measured match list. More on the catalog.292
ge11nn040000_08e7224bf8c7_000000000000_00000000000018
ge20nn030000_bf75ddd0bb29_000000000000_00000000000016
ge11nn07zhcn_ad6bb88d6320_000000000000_00000000000011
ge11nr040000_e1d2031bdfea_000000000000_0000000000008
ge11nn030000_042112399351_000000000000_0000000000004
ge11nr040000_88d30a62b7ad_000000000000_0000000000003
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.3
ge11nn040000_e1d2031bdfea_000000000000_0000000000002
ge20nr13enus_0c2c1d640f3e_000000000000_0000000000002

HTTP/2 frames (Akamai)

fingerprintco-occurrences
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, +60 more.The fingerprint page shows the full measured match list. More on the catalog.295
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.16
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.1

TCP SYN (JA4T)

fingerprintco-occurrences
29200_2-4-8-1-3_1460_7356

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.36292
Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.2623.112 Safari/537.3621
curl/8.14.116
Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36 QIHU 360SE13
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
Dalvik/2.1.0 (Linux; U; Android 9.0; ZTE BA520 Build/MRA58K)3
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.362
libredtail-http1
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.361
Mozilla/5.0 (compatible; Scanner/1.0)1

Country

fingerprintco-occurrences
CN · China333
GB · United Kingdom16
HK · Hong Kong SAR China6
FR · France3
RO · Romania2
US · United States1
CA · Canada1
ID · Indonesia1
TH · Thailand1

Network (ASN)

fingerprintco-occurrences
AS139220 · Sichuan Chuanxn IDC292
AS58461 · CT HangZhou IDC28
AS8560 · IONOS SE16
AS4134 · CHINANET BACKBONE11
AS137951 · ASLINE LIMITED6
AS3215 · Orange S.A.2
AS205275 · ROMARG SRL2
AS16276 · OVH SAS1
AS397731 · EliteWork LLC1
AS136052 · PT Cloud Hosting Indonesia1

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: python-httpx 0.28.1, python-requests 2.34.2, curl 8.23.0, +4 more.The fingerprint page shows the full measured match list. More on the catalog.16
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.3
0017,0019,0018,00163