FCrDNS, or forward-confirmed reverse DNS is a situation where a given IP address has forward (name-to-address) and reverse (address-to-name) DNS entries that match each other.
This tool ensures accurate FCrDNS configuration by validating both forward and reverse DNS lookups. It helps detect mismatches or misconfigurations that could affect email deliverability, spam filtering, and server trustworthiness—essential for mail server admins and network professionals.
