✅ ZeroSSL supports issuing certificates for IP addresses.
However, there are some exceptions and the validation is different.
- No certificate will be issued for reserved IP addresses.
Private IP addresses but also a few others - the list includes, but is not limited to the following: https://www.iana.org/assignments/iana-ipv4-special-registry/iana-ipv4-special-registry.xhtml
- Validation options are restricted to HTTP.
Only 1 out of the 3 verification methods ZeroSSL supports.