TCP SYN (p0f)

4:50+14:0:1420: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 TTL50+14
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_9249cab70c777

HTTP request (JA4H)

fingerprintco-occurrences
ge11nr05enus_f3bb7aa45ec4_000000000000_0000000000007

TCP SYN (JA4T)

fingerprintco-occurrences
42600_2-4-8-1-3_1420_97

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (compatible; Amzn-SearchBot/1.0; +https://developer.amazon.com/support/amazonbot)1
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Perplexity-User/1.0; +https://perplexity.ai/perplexity-user)1
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Applebot/0.1; +http://www.apple.com/go/applebot)1
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; meta-externalagent/1.1; +https://developers.facebook.com/docs/sharing/webmasters/crawler)1
Mozilla/5.0 (compatible; GrokBot/1.0; +https://x.ai/grokbot)1
Mozilla/5.0 (Linux; Android 14; Pixel 8) AppleWebKit/537.36 (KHTML, like Gecko; compatible; GPTBot/1.2; +https://openai.com/gptbot) Chrome/147.0.5256.18 Mobile Safari/537.361
Mozilla/5.0 (Linux; Android 14; Pixel 8) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/151.0.5657.99 Mobile Safari/537.36; compatible; Claude-SearchBot/1.0; +https://www.anthropic.com/claude-searchbot1

Country

fingerprintco-occurrences
TW · Taiwan7

Network (ASN)

fingerprintco-occurrences
AS396982 · Google LLC7