Legacy vs PI vs PA IPv4 Addresses: What's the Difference?
If you're buying IPv4 addresses in the RIPE region, you'll eventually come across three different resource types:
- Legacy
- Allocated PI (Provider Independent)
- Allocated PA (Provider Aggregatable)
At first glance they all look the same.
An IPv4 address is an IPv4 address, right?
Not exactly.
The status of the address block can affect:
- Whether you need a RIPE membership
- Annual maintenance costs
- Whether the block can be transferred again
- RPKI availability
- How attractive the block is to future buyers
I've seen buyers pay a premium for Legacy space without understanding why, and I've seen others accidentally buy PI space without realizing there would be ongoing sponsor fees.
Understanding the differences before purchasing can save a lot of money and frustration later.
Legacy IPv4 Addresses
Legacy resources are generally the most flexible IPv4 blocks available in the RIPE region.
The biggest advantage is simple:
There is no 24-month transfer restriction.
If a Legacy block is transferred to you today, it can be transferred again immediately.
Legacy resources can also be held without becoming a RIPE NCC member, making them popular with:
- Investors
- Companies that don't operate an LIR
- Organizations that value flexibility
Because of these advantages, Legacy IPv4 blocks often sell at a premium compared to equivalent PI or PA resources.
Allocated PA Addresses
Allocated PA (Provider Aggregatable) resources are the standard address blocks held by RIPE members.
To receive and hold PA space, you must have a RIPE NCC membership (LIR).
The main advantage is cost efficiency.
If you already operate an LIR, there are typically no separate annual resource fees for PA space beyond your membership costs.
The downside is the transfer restriction.
Transferred PA resources cannot be transferred again for 24 months.
Allocated PI Addresses
PI (Provider Independent) resources sit somewhere between Legacy and PA.
You don't need your own RIPE membership to hold them.
Instead, a Sponsoring LIR maintains the administrative relationship with RIPE on your behalf.
This makes PI resources attractive for organizations that:
- Need provider-independent space
- Don't want to operate an LIR
- Need address space transferred into the RIPE region
The tradeoff is ongoing sponsor costs and the same 24-month transfer restriction that applies to PA resources.
The Most Common Misunderstandings
A few misconceptions appear over and over again in IPv4 transactions:
"Legacy resources can't use RPKI"
Incorrect.
Legacy resource holders can use RPKI after signing the RIPE RPKI Agreement.
"All transferred IPv4 blocks have a 24-month transfer ban"
Incorrect.
Legacy resources can generally be transferred again immediately.
"You need a RIPE membership to own IPv4 addresses"
Not always.
Both Legacy and PI resources can be held without operating your own LIR.
"PI and PA cost the same"
Not necessarily.
PA resources are typically covered by your RIPE membership, while PI resources usually involve annual sponsoring fees.
Which One Should You Choose?
In simple terms:
Choose Legacy if:
- You want maximum flexibility
- You may resell the block later
- You want the lowest ongoing RIPE costs
Choose PA if:
- You already operate a RIPE LIR
- You don't plan to transfer the block again soon
- You want to avoid sponsor fees
Choose PI if:
- You don't want a RIPE membership
- You need provider-independent space
- You're comfortable working with a Sponsoring LIR
Final Thoughts
The status of an IPv4 block can be just as important as the size of the block itself.
Two identical /24s may have very different values depending on whether they're Legacy, PI, or PA resources.
Before purchasing IPv4 space, make sure you understand the operational and financial implications of each resource type.
For a full breakdown of transfer restrictions, RIPE fees, RPKI support, inter-RIR transfers, and real-world examples:
👉 https://ipv4center.com/blog/legacy-vs-allocated-pi-vs-allocated-pa-ipv4-subnets-complete-guide
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