TCP SYN (p0f)

4:55+9:0:1420:mss*30,9:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-09-05 21:08 · last seen 2026-09-05 21:08 · 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 TTL55+9
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_9249cab70c7727

HTTP request (JA4H)

fingerprintco-occurrences
ge11nr05enus_f3bb7aa45ec4_000000000000_00000000000025
ge11nr060000_6f1c3d56a901_000000000000_0000000000002

TCP SYN (JA4T)

fingerprintco-occurrences
42600_2-4-8-1-3_1420_927

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/118.0.0.0 Safari/537.361
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; GrokBot/1.0; +https://x.ai/grokbot)1
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; GPTBot/1.2; +https://openai.com/gptbot)1
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Amzn-SearchBot/1.0; +https://developer.amazon.com/support/amazonbot)1
Mozilla/5.0 (compatible; GrokBot/1.0; +https://x.ai/grokbot)1
Mozilla/5.0 (compatible; Twitterbot/1.0)1
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Slackbot-LinkExpanding/1.0; +https://api.slack.com/robots)1
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Claude-User/1.0; +https://www.anthropic.com/claude-user)1
Mozilla/5.0 (compatible; LinkedInBot/1.0; +http://www.linkedin.com)1
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Claude-SearchBot/1.0; +https://www.anthropic.com/claude-searchbot)1

Country

fingerprintco-occurrences
US · United States27

Network (ASN)

fingerprintco-occurrences
AS396982 · Google LLC27