If you need an easy way to detect your public ip address, we have a solution.
We provide several url's to detect your public ip.
This one will always show you your ip your are currently using, can be IPv4 or IPv6.
This one will only use IPv4. If you are behind a Carrier Grade Nat this can be not your public IP.
This one will only use IPv6 if available. Otherwise you will not reach this url.
Lets Encrypt Wildcard SSL Certificates with acme-challenge
If you enable wildcard for your domain, you will also see a textfield for entries for _acme-challenge txt records.
These records can be set during the certbot creation or renewal of the certificate.
More details are available here -> Lets Encrypt DNS-01 challenge