CCBot (Common Crawl)
Common Crawl operates CCBot for the open web corpus. Official IPv4/IPv6 prefixes for CCBot are published in machine-readable JSON at index.commoncrawl.org; use that feed with the documented user-agent for allowlisting.
Published ranges
CCBot
Official feedOfficial CCBot IP prefixes from index.commoncrawl.org/ccbot.json (Google-style shape).