User-Agent

Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)

first seen 2026-07-02 03:39 · last seen 2026-09-16 19:54 · JSON

Bot verification

This User-Agent declares a bot or user-triggered fetcher. Each connection's IP is checked at ingest against the verification channels the operator publishes — its crawler IP ranges and, where documented, forward-confirmed reverse DNS. A claim either channel confirms is identified; one confirmed by neither — outside the ranges, inside a different operator's, or failing the DNS check — is an impersonation signal. Meta publishes its network rather than crawler ranges, so its identified claims are network-confirmed and its unconfirmed misses are unverified claims, not proven spoofs. bot-claim anomalies →

claims	identified	unconfirmed miss	wrong operator	unconfirmed rate
ClaudeBot	493	27	0	5.2%

Last 7 days (133 observations)

Distinct clients per day (last 30 days, peak 4/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	`ClaudeBot 1.0`
Device class	`bot`
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
`t13d1011h2_61a7ad8aa9b6_3fcd1a44f3e3` Match?Exact match in Thumbprint's published controlled catalog captures: rust-reqwest 0.12.28.The fingerprint page shows the full measured match list. More on the catalog.	493
`t13d131200_f57a46bbacb6_9249cab70c77`	17
`t13d131300_f57a46bbacb6_1bd98dace775`	7
`t13d1516h2_8daaf6152771_d8a2da3f94cd` Match?Exact match in Thumbprint's published controlled catalog captures: chromium 149.0.7827.102, chrome 149.0.7827.102, chrome 149.0.7827.156, +25 more.The fingerprint page shows the full measured match list. More on the catalog.	3

HTTP request (JA4H)

fingerprint	co-occurrences
`ge20nn030000_80b089f68b8e_000000000000_000000000000`	493
`ge11nr05enus_f3bb7aa45ec4_000000000000_000000000000`	16
`ge11nn05enus_f3bb7aa45ec4_000000000000_000000000000`	6
`ge20nn050000_857b5fa3405d_000000000000_000000000000`	2
`ge11nn040000_e1d2031bdfea_000000000000_000000000000`	1
`ge11nr060000_6f1c3d56a901_000000000000_000000000000`	1
`ge20nn050000_7e80a5f53adf_000000000000_000000000000`	1

HTTP/2 frames (Akamai)

fingerprint	co-occurrences
`2:0;4:2097152;5:16384;6:16384\|5177345\|0\|m,s,a,p` Match?Exact match in Thumbprint's published controlled catalog captures: rust-reqwest 0.13.4, rust-reqwest 0.12.28, rust-reqwest 0.13.5, +3 more.The fingerprint page shows the full measured match list. More on the catalog.	493
`2:0;4:4194304;5:16384;6:262144;1:65536\|1073741824\|0\|a,m,p,s`	3

TCP SYN (p0f)

fingerprint	co-occurrences
`4:118+10:0:1460:62727,7:mss,sok,ts,nop,ws:df,id+:0`	329
`4:119+9:0:1460:62727,7:mss,sok,ts,nop,ws:df,id+:0`	150
`4:58+6:0:1420:mss*30,9:mss,sok,ts,nop,ws:df,id+:0`	24
`4:120+8:0:1460:62727,7:mss,sok,ts,nop,ws:df,id+:0`	8
`4:117+11:0:1460:62727,7:mss,sok,ts,nop,ws:df,id+:0`	6
`4:58+6:0:1420:mss*46,10:mss,sok,ts,nop,ws:df,id+:0`	3

TCP SYN (JA4T)

fingerprint	co-occurrences
`62727_2-4-8-1-3_1460_7`	493
`42600_2-4-8-1-3_1420_9`	24
`65320_2-4-8-1-3_1420_10`	3

Country

fingerprint	co-occurrences
`US` · United States	507
`BE` · Belgium	5
`NL` · Netherlands	3
`TW` · Taiwan	3
`JP` · Japan	1
`SG` · Singapore	1

Network (ASN)

fingerprint	co-occurrences
`AS16509` · Amazon.com, Inc.	493
`AS396982` · Google LLC	27