When you acquire internet services in a data center, the question will eventually arise: do you want to use PA or PI addresses? These abbreviations may sound technical, but the difference has important implications for ownership, flexibility, and dependency on your provider.
What do PA and PI mean?
The abbreviations PA and PI stand for:
- PA (Provider Aggregatable) – IP addresses owned by your internet provider.
- PI (Provider Independent) – IP addresses owned by your organization, issued via RIPE NCC (the European internet registry authority).
Both types of addresses are used to make networks and servers accessible on the internet, but they differ in who manages them and how easy it is to move them between providers.
PA Addresses: Convenient, but tied to one provider
With a PA block, the provider assigns a range of IP addresses from its own address space.
These addresses are easy to activate and are usually included as part of standard internet services.
Advantages of PA addresses:
- Quick and easy to obtain through your provider.
- Often included with your internet service.
- Less administrative overhead.
Disadvantages of PA addresses:
- Cannot be taken with you if you switch providers.
- DNS and router configurations must be reset during migration.
- Less control over routing and address management.
With PA addresses, you are dependent on your provider. This may not be an issue for long-term contracts, but for larger organizations, it can be less desirable.
PI Addresses: Independence and flexibility
PI addresses, on the other hand, are owned by your organization and registered in your name with RIPE.
They are not tied to a single provider and can move with you if you change network partners.
Advantages of PI addresses:
- Full independence from providers.
- Easier to manage in multisite or multihoming architectures.
- Suitable for organizations with multiple data center locations or their own ASN.
- Remain your organization’s property even if you change providers.
Disadvantages of PI addresses:
- Annual RIPE contributions or LIR fees apply.
- Management and routing require technical expertise.
- Not all providers support PI blocks by default.
PI addresses are particularly valuable for organizations that prioritize control, continuity, and provider independence.
When to choose which?
- Choose PA addresses if you have only one data center location, limited technical capacity, or when simplicity is more important than independence.
- Choose PI addresses if you use multiple providers, manage your own ASN, or want maximum control over IP routing and address management.
Summary
| Feature | PA (Provider Aggregatable) | PI (Provider Independent) |
|---|---|---|
| Ownership | Provider | Customer / Organization |
| Portable on provider change | ❌ No | ✅ Yes |
| RIPE registration in own name | ❌ No | ✅ Yes |
| Suitable for multihoming | ⚠️ Limited | ✅ Yes |
| Management complexity | Low | High |
Tip:
Always check with your data center or internet provider which type of IP addresses is provided and whether IPv6 is supported.
In modern networks, a combination of PI IPv4 and PI IPv6 is often the best choice for long-term flexibility.
