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What is the purpose of ipv4.example.com record in Plesk > Domains > example.com > DNS Settings?
Can it be safely removed?
It is recommended not to delete this domain from DNS settings.
The domain ipv4.example.com is required for a dual stack - IPv4 and IPv6 (if both IPv4 and IPv6 addresses are configured for a domain at Domains > example.com > Web Hosting Access).
www. will have both IPv4 and IPv6 addresses, ipv4. is only an IPv4 address, ipv6. will only have an IPv6 address.