| Shared IP | Ordinary websites, demos, and low-cost hosting | Site usability, total cost, and whether exclusive IP is actually required | Neighbor behavior and shared reputation are not fully controllable | Low | Best as the default control sample |
| Dedicated IPv4 | Mail, allowlists, RDP, and fixed-source identification use cases | Reverse DNS, IP history, replacement rules, and renewals | It costs extra and does not automatically mean cleaner or more stable | Medium | Best as a functional upgrade sample |
| Dedicated IP with replacement headroom | Workflows that care more about IP history, region identity, or long-run account environment | History, exclusivity, replacement frequency, and provider boundaries | Costs more and still needs network and resource validation as well | Medium-high | Best as a sample for more sensitive workflows |