Bytespider: robots token, verification and how to allow or disallow it

All 21 documented crawlers

Identity

documentation_url is null because we found no vendor page for this token that we could fetch on 2026-09-06. We record no claim about whether it obeys robots.txt: that is a widely repeated third party assertion we have not verified from the vendor.

Allow or disallow it

User-agent: Bytespider
Allow: /

User-agent: Bytespider
Disallow: /

A robots.txt rule is a request that a well behaved crawler honours. It is not an access control, and this page does not tell anyone what to choose.

Build a robots.txt with Bytespider and every other documented token

Questions

How do I allow Bytespider in robots.txt?

Add this group to the robots.txt at the root of the host: User-agent: Bytespider Allow: /. The token is matched case insensitively as a substring of the user agent by RFC 9309, and the longest matching rule wins.

How do I disallow Bytespider in robots.txt?

Add this group to the robots.txt at the root of the host: User-agent: Bytespider Disallow: /. A robots.txt rule is a request that a well behaved crawler honours; it is not an access control.

How do I verify a request really came from Bytespider?

We have not found a documented verification method for Bytespider: the vendor publishes neither an IP range file nor a reverse DNS convention that we could fetch. Without one, a user agent string is not evidence of origin.

What we measure

Of the 12976 seeded domains whose robots.txt we have read, 1798 disallow Bytespider for / and 11178 allow it, which is 13.9% disallowed, week 2026-W43. Counts only: no domain is named.

The weekly AI crawler access index

Sources

Free data

• The AEO Watch dataset
• Tranco top 1,000 AI crawler policy (CSV, CC BY 4.0)
• The AEO Watch API
• The checker as a command line tool (one file, no install)

Check a domain against every token

Check your own site

The same checks, run on your domain now: what robots.txt tells each AI crawler, whether the edge answers them, and whether the text is readable without JavaScript. Free, no signup.

Limits: 8 checks and 5 different domains per address per hour; a repeat of the same domain inside 7 days is answered from what we already hold.

AEO Watch is an independent, factual monitor. It is not affiliated with, endorsed by or speaking for any crawler vendor. Every statement is an observation with the date it was made and the raw evidence behind it: a robots.txt line, an HTTP status code, a header. There are no scores, no grades and no verdicts here, and nothing on this page is advice. A site opts out at any time and the opt out is honoured automatically and permanently.