IP Management

It depends on the company. Most don't even offer static IPs, and of those that do, it's usually only with business-level accounts, not residential accounts.

You'll have to be more specific if you want a more specific answer -- like which company are you interested in?

With extreme reluctance if you're not a business customer. When I had a business cable account with static IPs, TWC made us use their router. Period. End of discussion. My router had to be after that. No bridged connections allowed. And based on what I saw on traces they ran their network internally using the 10.x.x.x address block and had the routers turn these back into the public IPs to present to the customers. Basically TWC looked like a very large private network with non-private IPs assigned to each router.