I have a IP address, for example, 220.127.116.11. This IP address is a domain but it doesn't have domain name. Is it possible to get a certificate for this IP address? Thanks in advance.
I have no idea what this means.
Not from Let's Encrypt at this time. See also:
i think no, but without a domain you can use a dynamic dns service.
there are many providers
There are also domain registrars that offer free domains such as Freenom. Though Freenom specifically has had the occasional issue with their TLD DNS servers that temporarily prevent issuance.
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