TCP SYN (p0f)

4:49+15:0:1420:mss*30,9:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-09-05 18:21 · last seen 2026-09-05 18:21 · 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 TTL49+15
Options length0
MSS1420
Window sizemss*30
Window scale9
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
t13d131200_f57a46bbacb6_9249cab70c7713

HTTP request (JA4H)

fingerprintco-occurrences
ge11nr05enus_f3bb7aa45ec4_000000000000_00000000000010
ge11nr040000_e1d2031bdfea_000000000000_0000000000001
ge11nr060000_6f1c3d56a901_000000000000_0000000000001
ge11nr030000_cd680697de12_000000000000_0000000000001

TCP SYN (JA4T)

fingerprintco-occurrences
42600_2-4-8-1-3_1420_913

User-Agent

fingerprintco-occurrences
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ChatGPT-User/1.0; +https://openai.com/bot)2
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; Google-Extended/1.0; +http://www.google.com/bot.html1
Mozilla/5.0 (compatible; LinkedInBot/1.0; +http://www.linkedin.com)1
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; Twitterbot/1.01
Mozilla/5.0 (compatible; Claude-User/1.0; +Claude-User@anthropic.com)1
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.614.162 Safari/537.36; compatible; Claude-User/1.0; +Claude-User@anthropic.com1
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:121.16) Gecko/20100101 Firefox/121.16; compatible; TelegramBot/1.01
Mozilla/5.0 (Linux; Android 14; Pixel 8) AppleWebKit/537.36 (KHTML, like Gecko; compatible; WhatsApp/10.0.2.1) Chrome/136.0.4625.35 Mobile Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.4509.79 Safari/537.36; compatible; OAI-SearchBot/1.3; +https://openai.com/searchbot1
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/118.0.3236.66 Safari/537.36; compatible; OAI-SearchBot/1.4; robots.txt; +https://openai.com/searchbot1

Country

fingerprintco-occurrences
TW · Taiwan13

Network (ASN)

fingerprintco-occurrences
AS396982 · Google LLC13