rssrssrssrss is a free open source tool from the newsletter platform Buttondown that combines several RSS, Atom or JSON feeds into a single merged feed URL for the person who requested it. It is a stateless web application that fetches the source feeds on demand when the merged feed is requested and caches the result for ten minutes, and this exact user agent string is set in the published source at github.com/buttondown/rssrssrssrss. It is deployed on Vercel serverless infrastructure, which accounts for the large number of distinct source addresses, and no dedicated IP ranges or reverse DNS hostnames are published for it.

At a glance

Operator: Buttondown
Type: Aggregator

How Centinel checks it

User agent: The request calls itself this crawler. Anyone can send the same string.

rssrssrssrss publishes nothing Centinel can check a source against, so a match reports the name and leaves the source unconfirmed. The match tokens, verification domains, and address feeds are not published here.

Allowing or blocking it

The crawler object in the /validate response sets access_allowed to true only for a verified source that your tenant allowlists. A policy rule can allow or block this crawler by its category, Aggregator.

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