TCP SYN (p0f)

4:51+13:0:1420: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

Decomposed attributes

IP version4
Initial TTL51+13
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_9249cab70c7725

HTTP request (JA4H)

fingerprintco-occurrences
ge11nr05enus_f3bb7aa45ec4_000000000000_00000000000022
ge11nr060000_6f1c3d56a901_000000000000_0000000000003

TCP SYN (JA4T)

fingerprintco-occurrences
42600_2-4-8-1-3_1420_925

User-Agent

fingerprintco-occurrences
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; ChatGPT-User/1.0; +https://openai.com/bot1
Mozilla/5.0 (compatible; OAI-SearchBot/1.3; +https://openai.com/searchbot)1
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ChatGPT-User/1.0; +https://openai.com/bot)1
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; Perplexity-User/1.0; +https://perplexity.ai/perplexity-user1
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; TelegramBot/1.0)1
Mozilla/5.0 (compatible; ChatGPT-User/1.0; +https://openai.com/bot)1
Mozilla/5.0 (compatible; Perplexity-User/1.0; +https://perplexity.ai/perplexity-user)1
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; facebookexternalhit/1.1; +http://www.facebook.com/externalhit_uatext.php)1
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; Claude-User/1.0; +Claude-User@anthropic.com1
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Claude-User/1.0; +https://www.anthropic.com/claude-user)1

Country

fingerprintco-occurrences
TW · Taiwan25

Network (ASN)

fingerprintco-occurrences
AS396982 · Google LLC25