User-Agent

Claude-User (claude-code/2.1.281; +https://support.anthropic.com/)

first seen 2026-09-27 13:40 · last seen 2026-09-28 13:31 · JSON

Decomposed attributes

Browser / clientclaude-code 2.1.281
Device classbot
Declared URLhttps://support.anthropic.com/
Noteinferred from the self-declared string — a claim, not a measurement; compare with the wire fingerprints above

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
t13d181000_5d04281c6031_78e6aca7449b3

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn050000_2469c960a647_000000000000_0000000000003

TCP SYN (p0f)

fingerprintco-occurrences
6:48+16:0:1432:65535,8:mss,nop,ws,nop,nop,sok:flow:02
4:46+18:0:1280:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df:01

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-1-3-1-1-4_1432_82
65535_2-1-3-1-1-8-4-0-0_1280_61

Country

fingerprintco-occurrences
GB · United Kingdom2
AT · Austria1

Network (ASN)

fingerprintco-occurrences
AS2856 · British Telecommunications Limited2
AS9009 · M247 Europe SRL1