TCP SYN (p0f)

4:49+15:0:1460:mss*29,10:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-12 01:11 · last seen 2026-10-31 08:14 · JSON

Last 7 days (3 observations)

Distinct clients per day (last 30 days, peak 8/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 TTL49+15
Options length0
MSS1460
Window sizemss*29
Window scale10
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
t13i1909h2_9dc949149365_97f8aa674fd951
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.8
t13d4312h1_c7886603b240_b26ce05bbdd64
t12d610700_8a10cb45a794_4446390ac2244
t13d1313h2_f57a46bbacb6_9249cab70c774
t13i131000_f57a46bbacb6_ab7e3b40a6772
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
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.1
t13d190900_9dc949149365_97f8aa674fd91

HTTP request (JA4H)

fingerprintco-occurrences
ge20nr030000_80b089f68b8e_000000000000_00000000000036
ge20nr030000_ff50983941c1_000000000000_00000000000014
ge20nn030000_bf75ddd0bb29_000000000000_0000000000008
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.4
ge11nn040000_4f6f4aad0c1e_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.3
ge11nr030000_0db47b7d240d_000000000000_0000000000002
ge11nn030000_0db47b7d240d_000000000000_0000000000001
ge20nr040000_be74ea4f9dce_000000000000_0000000000001
ge20nr020000_fb4f949fd323_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
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.51
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.8
1:65536;2:0;3:1000;4:6291456;6:262144|15663105|1:1:0:256|m,a,s,p4
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.1

TCP SYN (JA4T)

fingerprintco-occurrences
42340_2-4-8-1-3_1460_1072

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (compatible; CyberConvoyScout/1.0; +https://scout.cyberconvoy.co)51
curl/8.14.18
Mozilla/5.0 (iPhone; CPU iPhone OS 7_1_2 like Mac OS X) AppleWebKit/537.36 (KHTML, like Gecko) Version/7.0 Mobile Safari/537.36 (compatible; Bytespider; https://bytedance.sg.larkoffice.com/docx/K5bxdypulop3IIxrJb0lOjLVgFe)4
Go-http-client/1.13
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.362
Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; spider-feedback@bytedance.com)2
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.361
Mozilla/5.0 (compatible; CensysInspect/1.1; +https://about.censys.io/)1
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 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.361

Country

fingerprintco-occurrences
US · United States36
GB · United Kingdom18
SG · Singapore8
KR · South Korea5
FR · France5
DE · Germany1
NL · Netherlands1
HK · Hong Kong SAR China1
CN · China1

Network (ASN)

fingerprintco-occurrences
AS20473 · The Constant Company, LLC61
AS16509 · Amazon.com, Inc.7
AS6079 · RCN4
AS398722 · Censys, Inc.1
AS4134 · CHINANET BACKBONE1
AS150436 · Byteplus Pte. Ltd.1
AS397966 · ReadyDedis, LLC1

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.8
001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.21.13, curl 8.7.1.The fingerprint page shows the full measured match list. More on the catalog.5
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