User-Agent

Claude-User (claude-code/2.1.295; +https://support.anthropic.com/)

first seen 2026-10-13 10:30 · last seen 2026-10-15 11:55 · 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 / client	`claude-code 2.1.295`
Device class	`bot`
Declared URL	`https://support.anthropic.com/`
Note	`inferred 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)

fingerprint	co-occurrences
`t13d181000_5d04281c6031_78e6aca7449b`	1
`t13d170900_d1c966aaa946_4c1ab0552904`	1

HTTP request (JA4H)

fingerprint	co-occurrences
`ge11nn050000_2469c960a647_000000000000_000000000000`	2

TCP SYN (p0f)

fingerprint	co-occurrences
`4:121+7:0:1343:65535,8:mss,nop,ws,nop,nop,sok:df,id+:0`	1
`4:51+13:0:1380:mss*44,7:mss,sok,ts,nop,ws:df,id+:0`	1

TCP SYN (JA4T)

fingerprint	co-occurrences
`64240_2-4-8-1-3_1380_7`	1
`65535_2-1-3-1-1-4_1343_8`	1

Country

fingerprint	co-occurrences
`US` · United States	1
`FR` · France	1

Network (ASN)

fingerprint	co-occurrences
`AS7018` · AT&T Enterprises, LLC	1
`AS394089` · Google LLC	1

TLS supported groups

fingerprint	co-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.	1