TCP SYN (p0f)

4:52+12:0:1460:mss*29,10:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-07-18 15:57 · last seen 2026-09-12 05:54 · JSON

Last 7 days (1 observations)

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 TTL52+12
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_3a8073edd8ef27
t13d190900_9dc949149365_97f8aa674fd91

HTTP request (JA4H)

fingerprintco-occurrences
ge11nr040000_8b1ed2202073_000000000000_00000000000027
ge11nn040000_e1d2031bdfea_000000000000_0000000000001

TCP SYN (JA4T)

fingerprintco-occurrences
42340_2-4-8-1-3_1460_1028

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (compatible; Applebot/0.1; +http://www.apple.com/go/applebot)3
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; GPTBot/1.3; +https://openai.com/gptbot)2
Mozilla/5.0 (compatible; PerplexityBot/1.0; +https://perplexity.ai/perplexitybot)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
CH · Switzerland27
HK · Hong Kong SAR China1

Network (ASN)

fingerprintco-occurrences
AS53667 · FranTech Solutions27
AS398722 · Censys, Inc.1