Technically, it is not possible to permanently own a domain name, as all domain names have expiration dates and must be periodically renewed to remain active. The length of time that a domain name can be registered for depends on the specific top-level domain (TLD) that is being used.
Most TLDs, such as .com, .net, and .org, can be registered for a period of one to ten years. Some TLDs, such as .info and .biz, can be registered for shorter periods, typically one to five years. There are also some TLDs, such as .coop and .museum, that have more restrictive registration requirements and may only be available to certain types of organizations.
It is important to note that the expiration date of a domain name is not the same as the ownership of the domain name. When a domain name is registered, the registrant is granted the right to use the domain name for the duration of the registration period.
However, the registrant does not have ownership of the domain name in the same way that they might own a physical asset, such as a car or a house.
If you want to ensure that you can continue to use a domain name, it is important to periodically renew the domain name before it expires.
Most domain name registrars will send reminders to the registrant when the domain name is approaching its expiration date, but it is ultimately the responsibility of the registrant to ensure that the domain name is renewed in a timely manner.