Online openssl private certificate and key with alternative DNS

Openssl added a nice alternative to the config file or extention to create requests with alternative DNS. This will create a key and certificate (not certificate request) with two additional DNS alt1.example.net and alt2.example.net

sudo openssl req -x509 -nodes -days 3650 -newkey rsa:4096 -keyout mykey.key -out mycer.crt  -subj '/CN=main.example.net' -addext 'subjectAltName=DNS:alt1.example.net,DNS:alt2.example.net'