User-Agent

Claude-User (claude-code/2.1.289; +https://support.anthropic.com/)

first seen 2026-10-13 06:45 · last seen 2026-10-15 07:55 · 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

Browser / clientclaude-code 2.1.289
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_78e6aca7449b5

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn050000_2469c960a647_000000000000_0000000000005

TCP SYN (p0f)

fingerprintco-occurrences
4:112+16:0:1358:mss*44,8:mss,nop,ws,nop,nop,sok:df,id+:03
4:113+15:0:1358:mss*44,8:mss,nop,ws,nop,nop,sok:df,id+:02

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-1-3-1-1-4_1358_85

Country

fingerprintco-occurrences
NL · Netherlands5

Network (ASN)

fingerprintco-occurrences
AS395092 · Shock Hosting LLC5

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,0018 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 155.0.8059.40, chrome 156.0.8078.73, chromium 156.0.8078.47, +8 more.The fingerprint page shows the full measured match list. More on the catalog.3