TCP SYN (p0f)

4:50+14:0:1460:mss*29,10:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-13 15:34 · last seen 2026-09-12 20:31 · JSON

Last 7 days (5 observations)

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 TTL50+14
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_97f8aa674fd972
t13d1515h2_8daaf6152771_de4a06bb82e35
t13d4907h2_0d8feac7bc37_7395dae3b2f3 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1.The fingerprint page shows the full measured match list. More on the catalog.3
t13d171000_5b57614c22b0_78e6aca7449b2
t12d610700_8a10cb45a794_4446390ac2242
t13d1313h2_f57a46bbacb6_9249cab70c772
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
t13d1515h1_8daaf6152771_0a20fe35d3a51
t13d190900_9dc949149365_97f8aa674fd91
t13d3112h2_e8f1e7e78f70_b26ce05bbdd6 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.5.0, php-curl 7.88.1.The fingerprint page shows the full measured match list. More on the catalog.1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nr030000_80b089f68b8e_000000000000_00000000000049
ge20nr030000_ff50983941c1_000000000000_00000000000021
ge20nr14engb_0967e05ecb2c_000000000000_0000000000004
ge20nn020000_5594a17e7e7e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0, curl 8.18.0, +9 more.The fingerprint page shows the full measured match list. More on the catalog.4
ge20nr040000_88d30a62b7ad_000000000000_0000000000002
ge11nn050000_2469c960a647_000000000000_0000000000002
ge11nn040000_4f6f4aad0c1e_000000000000_0000000000002
ge20nr020000_fb4f949fd323_000000000000_0000000000002
ge20nn04enus_989c7cc05c9b_000000000000_0000000000002
ge11nr030000_0db47b7d240d_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 1.26.8, go-net/http 1.26.7, +6 more.The fingerprint page shows the full measured match list. More on the catalog.72
1:65536;2:0;3:1000;4:6291456;6:262144|15663105|1:1:0:256|m,a,s,p5
3:100;4:10485760;2:0|1048510465|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0.The fingerprint page shows the full measured match list. More on the catalog.3
1:65536;2:0;4:6291456;6:262144;4:1048576|15663105|1:0:0:256|m,a,s,p2
1:65536;2:0;3:1000;4:6291456;6:262144|15663105|5:1:0:256|m,a,s,p1
1:65536;2:0;3:1000;4:6291456;6:262144|15663105|3:1:0:256|m,a,s,p1
3:100;4:33554432;2:0|33488897|0|m,p,s,a Match?Exact match in Thumbprint's published controlled catalog captures: php-curl 7.88.1.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_1089

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (compatible; CyberConvoyScout/1.0; +https://scout.cyberconvoy.co)72
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36 Edg/133.0.0.05
curl/8.7.13
Claude-User (claude-code/2.1.220; +https://support.anthropic.com/)2
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)2
Go-http-client/1.11
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/136.0.0.0 Safari/537.361
Mozilla/5.0 (Linux; Android 5.0) AppleWebKit/537.36 (KHTML, like Gecko) Mobile Safari/537.36 (compatible; Bytespider; spider-feedback@bytedance.com)1
curl/7.88.11

Country

fingerprintco-occurrences
US · United States62
FR · France11
SG · Singapore9
GB · United Kingdom7
HK · Hong Kong SAR China2
SE · Sweden1

Network (ASN)

fingerprintco-occurrences
AS20473 · The Constant Company, LLC73
AS20860 · IOMART CLOUD SERVICES LIMITED7
AS16509 · Amazon.com, Inc.4
AS396856 · Sharon Networks, LLC4
AS398722 · Censys, Inc.1
AS39287 · Materialism s.r.l.1
AS150436 · Byteplus Pte. Ltd.1
AS140042 · Zhipinshang (Hongkong) Electron Communication Technology Limited1