Not sure how this even got to the front page, don't ever do this, you are sending your traffic to someone else who _will_ start phishing attempts once you forget about it.

If you don't want to support ipv4, you should either just host a static page or a text file saying you don't support ipv4, or just don't add an A record.

If you want a frontend to ipv4, just add an A record with your ipv4 address, it's that simple.