@Dissident Sound Depends on your ISP.

I work for a small ISP that will happily give out static addresses and subnets (for a cost). But some ISPs are restrictive.

If you have the technical knowhow, you can use a dynamic DNS service like DynDNS to help even in the absence of a static IP. Or you can use something like ngrok. The solution I'm building is in line with the latter (but specialized to ActivityPub).