Domain Reserved:

cours-aes.fr.cr

Specialized subdomains/prefixes (such as www, ftp, mail, irc, or @) are reserved to avoid confusion.
Legacy: .fr.cr reserved subdomains preserved from an earlier registry. The cours-aes.fr.cr subdomain is reserved to prevent security issues or abuse, and is not available for registration.

Learn more about reserved domains: PublicZone.org ICANN: Reserved Names & Domains What is a Reserved Domain? Reserved Domain Practices

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