How to Buy IP Addresses Safely: A Business Guide to IPv4 Transfers

IPv4 space is still part of daily network operations. Even with IPv6 available, many services, partners, and older systems still expect IPv4 connectivity. Because there is no large fresh supply, most buying happens through the secondary market under the transfer policies of the regional internet registries. A safe purchase is mostly a process problem: confirm the rules, verify the seller, protect payment, and complete the technical handover. This guide explains those steps in plain language.

What you are actually buying

It helps to be clear about what changes hands. You are not buying a physical object, and registries are careful about how they describe address rights. A transfer updates who is recorded as the holder of an address block in the registry database. Think of it as the registry recognizing your organization as the responsible party for that range, not as a deed to property.

Right-size the block

Buy what you can justify using, not the largest block you can afford. Under ARIN policy, a recipient must demonstrate the need for up to a 24-month supply of IPv4 addresses when receiving a transfer into the ARIN region. Planning around real demand keeps you inside policy and prevents you from tying up budget in addresses you do not use.

Know the rules before you shop

Each registry covers a different part of the world and runs its own transfer process. Knowing which registry applies to you and to the seller shapes the rest of the purchase.

ARIN (North America)

In the ARIN region, recipients demonstrate up to a 24-month need, and the minimum transfer size is a /24. ARIN allows inter-RIR transfers only with registries that have reciprocal, compatible needs-based policies, currently APNIC, RIPE NCC, and LACNIC. The workflow includes a non-refundable processing fee, and the transfer completes once all fees are received and a signed registration services agreement is in place where applicable.

RIPE NCC (Europe, Middle East, Central Asia)

RIPE NCC enforces a 24-month restriction before a received IPv4 block or 16-bit ASN can be transferred again. Most in-region transfers finish in one or two business days, while inter-RIR cases need approval from both registries and take longer. For ARIN to RIPE transfers, the recipient must provide a plan to use at least 50 percent of the transferred addresses within five years.

APNIC (Asia-Pacific)

APNIC requires an account to take part in transfers and may request supporting information, with conditions and fees that can apply. It recognizes three transfer types: mergers and acquisitions, historical resources, and unused IPv4 or ASNs. If your deal crosses into the APNIC region, plan for that account setup early.

This is not legal advice. Registry policies change, so confirm the current requirements on each registry’s own pages before you commit.

Buyer due-diligence checklist

This is where most avoidable risk is removed. Work through these checks before money moves.

• Verify the seller’s authority. The registry record, usually Whois or RDAP, should show the same organization that is selling. ARIN requires the source to be the current registrant, so a mismatch is a serious warning sign.
• Screen reputation. Run sample addresses against major blocklists. If a range is listed, note who is responsible for removal and what proof the blocklist operator requires.
• Confirm routability and security state. Check any existing route origin authorizations and plan for the ROA, IRR, and reverse DNS changes you will make after the transfer.
• Check eligibility. Make sure the block is transferable and not drawn from reserved pools that carry special restrictions.

Treat each item as a gate. If you cannot get a clean answer, slow down rather than push ahead.

How to pay safely

Payment is the point with the most exposure, so structure it carefully. Escrow is common because it protects both sides. The buyer’s funds sit with a neutral third party and are released only after the transfer is verified, which lines up payment with the actual change of holder in the registry. As a rough guide, typical IPv4 escrow transactions take about 5 to 20 days to conclude.

A secured wire is another route some buyers use, usually with clear conditions tied to transfer milestones. Whatever method you pick, avoid arrangements that require full payment before anything is recorded. Tie the release of money to verifiable steps, and keep your finance and legal teams involved in the terms.

The transfer itself

Once terms are agreed and payment is arranged, the registry process begins.

Post-transfer to-dos

The work is not finished when the record updates. A clean handover depends on the technical follow-through.

• Create or adjust your route origin authorizations. ARIN advises source organizations to update ROAs, IRR objects, and reverse DNS, and recipients must create their own ROAs and IRR records after the transfer.
• Publish your IRR route objects so networks can accept your announcements.
• Update reverse DNS to match your new holdership.
• Monitor deliverability and reputation for a few weeks, and remediate any lingering listings through the responsible provider, following the blocklist operator’s guidance.

Treat these tasks as required launch work. Skipping them is how a legitimate block can cause routing or email problems on day one.

Where to source and vet IPv4 blocks

Start close to home. Internal teams, sister companies, or partner networks may already hold space they are not using, and an intra-organization transfer can be the simplest path. When you need to look outside, evaluate reputable facilitators and marketplaces, and apply the same diligence checklist you would use for any seller.

If you use a specialist to buy IP addresses, look for support across the registries involved in your deal, such as ARIN, RIPE, or APNIC, and ask whether escrow or secured wire options are part of the workflow. A facilitator can help coordinate two-sided ticketing and keep paperwork moving, which is useful for inter-RIR deals where timing and approvals are more complicated. Keep your own standards in place: a third party can manage steps, but you still need to confirm the registry record, screen reputation, and complete the post-transfer technical work.

Cost is its own conversation, and the secondary market changes over time. Reviewing independent IPv4 price trends can give you context on where rates have been heading and help you set realistic expectations with your finance team. For broader context on how digital infrastructure decisions affect business operations, this digital business resource can be a useful reference.

Conclusion

Buying IPv4 space safely is less about clever tactics and more about discipline. Confirm that the deal fits the registry’s rules, check the seller and the block’s reputation before you pay, structure payment so money follows verified progress, and finish the technical handover so the addresses work when they are yours. Treat the purchase like any other IT change, with clear acceptance criteria and a checklist your team follows. That turns a complex purchase into a documented project you can repeat with more confidence.

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