unlike domain names you cannot guarantee to own it permanently.
I'm not convinced this is a property of domain names. It seems like as long as you pay your bills, your provider stays in business, and no governments get involved, both these identifiers are effectively permanent. Your IP is likely provided by the same people who own or co-locate your physical server anyway. In any case, you're likely to get enough advance notice of ip changes to update your various accounts.
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IP address is harder to compromise, however, unlike domain names you cannot guarantee to own it permanently.
I'm not convinced this is a property of domain names. It seems like as long as you pay your bills, your provider stays in business, and no governments get involved, both these identifiers are effectively permanent. Your IP is likely provided by the same people who own or co-locate your physical server anyway. In any case, you're likely to get enough advance notice of ip changes to update your various accounts.