If you want a fixed ip adress, you will have to ask your internet provider. It is unfortunately not very well spread in the mainstream internet packages. Orange offers instead a "Dyndns" that allows to have a correspondance in letters to your ip but with which you can not attach easily a domain name. A few domain name registrar like infomaniak, offer however to register a domain name for the dyndns which is easily reachable without extra cost on most operators.
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