TCP SYN (p0f)

4:54+10:0:1460:mss*29,10:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-07-04 07:18 · last seen 2026-09-05 10:16 · 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 TTL54+10
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
t13d1011h1_61a7ad8aa9b6_3a8073edd8ef24
t13i1909h2_9dc949149365_97f8aa674fd919
t13d1716h2_5b57614c22b0_ca3c9f3127701
t13d1515h1_8daaf6152771_de4a06bb82e31

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn040000_8b1ed2202073_000000000000_00000000000013
ge11nr040000_8b1ed2202073_000000000000_00000000000011
ge20nr030000_80b089f68b8e_000000000000_00000000000011
ge20nr030000_ff50983941c1_000000000000_0000000000008
ge20nr10enus_b3034183f430_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 154.0, +21 more.The fingerprint page shows the full measured match list. More on the catalog.1
ge11nn13enus_9db22d02e17a_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.19
1:65536;2:0;4:131072;5:16384|12517377|3:0:0:22|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 154.0, +25 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_1045

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (compatible; CyberConvoyScout/1.0; +https://scout.cyberconvoy.co)19
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; GPTBot/1.3; +https://openai.com/gptbot)3
Mozilla/5.0 (compatible; Applebot/0.1; +http://www.apple.com/go/applebot)2
Mozilla/5.0 (compatible; YandexBot/3.0; +http://yandex.com/bots)2
Mozilla/5.0 (compatible; OAI-SearchBot/1.3; +https://openai.com/searchbot)2
Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)2
CCBot/2.0 (https://commoncrawl.org/faq/)2
Mozilla/5.0 (compatible; Google-CloudVertexBot; +https://cloud.google.com/vertex-ai-bot)2
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ChatGPT-User/1.0; +https://openai.com/bot)2
Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)2

Country

fingerprintco-occurrences
NL · Netherlands24
FR · France11
US · United States10

Network (ASN)

fingerprintco-occurrences
AS41608 · NextGenWebs, S.L.24
AS20473 · The Constant Company, LLC21