Just use the ip address as the `-d` parameter:

```
acme.sh  --issue  -d 1.1.1.1  -w /etc/apache/xxxxxx
```

As the rfc 8738 requires: https://tools.ietf.org/html/rfc8738

The ip address can not be validated by dns methods. 
Only http/webroot and alpn methods are allowed.




