Claude-User

by Anthropic

About this crawler

User-triggered fetches when Claude opens a page to answer a person.

Usually means: A person asked an AI assistant a question, and the assistant fetched this URL to answer with fresh context or citations.

User agent

Claude-User

Reignat matches these as user-agent tokens, not full browser strings. Providers may add surrounding version or product text.

IP verification

Verified when user agent and IP range both match

Reignat first matches the crawler user-agent token, then compares the request IP with published ranges from Anthropic.

1

User agent

Request user agent contains Claude-User.

2

Request IP

Server-side tracking forwards the crawler IP seen by your backend.

3

Range check

The IP is compared with published CIDR ranges from the JSON range endpoint.

Sample IP ranges

216.73.216.0/2234.162.230.222/3234.162.244.71/3234.162.191.81/3234.150.241.79/3234.85.172.162/3235.245.175.129/3234.182.222.37/3234.186.108.163/3235.245.89.239/32

Showing up to 10 ranges from the published official source.

Range endpoint

https://claude.com/crawling/bots.json