For a product with a long horizon and reputation sensitivity, the math usually favors buying, and your case sounds like a textbook example. Rented space can be pulled at renewal, and losing a range you have spent two years building reputation on is a real operational hit, not a theoretical one. Run the payback: monthly rate times twelve times three, compared against purchase price, and most /24 scenarios cross over inside that window. When I priced
IPv4 Addresses , both ways at IPv4.online, buying won for anything we planned to keep past two years. Lease the short lived stuff, own the core. Mixed approach is fine and very common.