For a maybe-one-year need, leasing is the sensible call, no argument. We had a similar spot and chose to
rent or lease IPv4 online rather than sink capital into blocks we might not keep. Terms were flexible: anything from a month up to multi-year, dedicated space from /24 to /16, and pricing on a /24 started in the high double digits a month with no setup or surprise charges. They sorted the LOA and assignment so we had it in use quickly. Since your timeline is fuzzy, ask specifically about early-exit terms before signing, that is the one clause worth nailing down. One clear monthly price beat the leasing quotes we got elsewhere.
