How to Buy IPv4 Addresses for Scalable Digital Infrastructure

Smart city programs keep adding connected endpoints: traffic sensors, transit systems, public safety networks, inter-agency links, and multi-cloud services. Many still need public IPv4 addresses to reach partners, vendors, and legacy equipment reliably. 

That remains true even as more internet traffic moves to IPv6. Public IPv6 adoption has reached roughly half of measured users in some large networks, pointing to a maturing dual-stack internet rather than an immediate IPv4 sunset.

For municipal technology leaders, IPv4 addresses are critical digital infrastructure. Acquiring them well means forecasting real need, following registry policy, choosing a safe procurement route, and securing routing and reputation before the block goes live. This guide walks city buyers through that process, with attention to policy differences across ARIN, RIPE NCC, and APNIC.

Key Takeaways

Forecast address need before you shop, then match the purchase to registry rules, procurement risk, ownership checks, and an IPv6-first roadmap.

Why IPv4 still matters in a smart-city stack

The IPv6 milestone is real, but it describes a dual-stack world, not a replacement. Many vendor systems, partner networks, and older operational technology still expect IPv4 connectivity. Public safety applications, inter-agency VPNs, and IoT gateways often depend on stable, routable IPv4 space that partners already trust.

Cloud continuity is another reason. Major cloud platforms support Bring Your Own IP (BYOIP), which lets an organization use its own public IP addresses for cloud resources. This can keep smart-city endpoints reachable at the same addresses as workloads move between environments. Owning address space, rather than renting provider space, gives cities more control over continuity.

Plan your address strategy before you shop

Start with an inventory. List where public IPv4 is genuinely required: edge sites, data centers, inter-agency links, IoT gateways, and multi-cloud endpoints. Many internal systems can run on IPv6 with translation, so scope the public IPv4 request to what actually needs global reachability.

Then pick your registry region. A U.S. city will typically work with ARIN, but a program operating across regions may need to plan for RIPE NCC or APNIC rules as well.

Choose a minimum workable block size. In ARIN, the smallest IPv4 transfer size is a /24, and organizations without prior direct space qualify for an initial /24. A /24 is also the smallest prefix most networks accept globally, which makes it the practical floor for many buyers.

Policy pre-checks that make or break approval

Registry policy determines whether a transfer can complete and how long you must hold the block afterward. Confirm the current rules directly with each registry before you sign a purchase agreement, since policies and fees can change.

ARIN. ARIN charges a non-refundable processing fee for each IPv4 transfer request, invoiced before evaluation begins. Recipients must be able to justify the requested space, including expected use within the registry's planning window, and may need to show utilization of any prior space. Blocks received from ARIN's waiting list cannot usually be transferred to another organization for 60 months, except under qualifying merger and acquisition transfers.

RIPE NCC. RIPE NCC policy restricts transfers of scarce resources such as IPv4 for 24 months after an allocation or transfer. If you buy in the RIPE region, plan around that re-transfer hold.

APNIC. APNIC may require membership or transfer fees before completing certain IPv4 transfers, especially for initial recipients. Budget for those fees and prepare a documented utilization plan.

A step-by-step buying workflow for cities

1. Validate seller ownership. Confirm the chain of custody, the registry OrgID or maintainer, and that the block is free of disputes.
2. Pre-approve internally. Justify the request against registry policy and your procurement rules before you commit funds.
3. Select a procurement route. Cities can use a registry waiting list, a transfer marketplace, or a private sale handled by a broker. Waiting lists cost little but offer limited size and uncertain timing. A marketplace such as IPv4.Global provides listings and standard payment protections, while brokers can help with private sourcing and transfer coordination.
4. Set payment and risk controls. Decide who pays registry fees, and use escrow or milestone releases so funds move only as transfer steps complete.
5. Close the transfer. Sign the registry agreement, complete contracting, and update the public records so ownership reflects your organization.

If you prefer a managed route with blacklist checks, escrow or wire options, and end-to-end ARIN, RIPE NCC, and APNIC transfer support, Brander Group can help you buy IP addresses as part of a policy-compliant acquisition plan. Treat Brander Group as one commercial option among several, and confirm current fees, availability, and transfer scope directly before committing.

Due diligence checklist

• Ownership and hold-period checks. Confirm the seller can legally transfer the block, and account for hold rules such as the RIPE 24-month restriction and the ARIN 60-month waiting-list rule.
• Reputation and abuse history. Screen the addresses for blocklist issues. Public IP and domain reputation tools can reveal problems before cutover.
• Legacy routing objects. Identify stale IRR route objects that should be cleaned up so old announcements do not interfere.
• RPKI readiness. Confirm you can create Route Origin Authorizations (ROAs). To create ROAs and IRR objects with ARIN, the resources must be under an ARIN Registration Services Agreement (RSA).
• Geolocation alignment. Plan an RFC 8805 geofeed so services are not routed or localized to the wrong region.

Bring the block online safely

Create ROAs through hosted RPKI and publish IRR route objects, then verify that your upstream providers filter accordingly. Announce your prefixes, monitor propagation, and watch for anomalies during the first days of use. Publish an RFC 8805 geofeed so mapping and content providers place your addresses in the correct city or region.

When cloud continuity matters, use BYOIP to bring the block into your cloud projects, keeping in mind that each platform has its own onboarding steps. Google Cloud's BYOIP documentation describes how organizations can bring public IP addresses into cloud resources, which can help preserve stable addressing for citizen-facing endpoints.

Budget and timeline signals

Market pricing is volatile and regional, so treat any figure as a snapshot. Larger IPv4 blocks often have a lower per-address price than smaller blocks, while /24s and other small blocks tend to cost more per address. Use market data for budgeting context, not as a fixed quote.

Beyond the purchase price, budget for registry processing fees and possible APNIC membership or transfer fees depending on your region. Also account for internal effort to set up RPKI and IRR, run due diligence, and manage cutover. These costs are easy to overlook.

Alternatives and complements

Buying is not the only path. Short-term leasing can cover a temporary need or a pilot, though public-sector procurement rules may make ownership cleaner for long-lived infrastructure. Weigh the tradeoffs against your program timeline and audit requirements.

At the same time, accelerate IPv6 rollout for new services so future growth does not depend on scarce IPv4 supply. A dual-stack roadmap lets you keep IPv4 for reachability today while shifting new deployments toward IPv6 over time. For broader planning context, the case for investing in connectivity frames connectivity as a core layer of smart-city infrastructure. Where a managed acquisition still makes sense, Brander Group can fold blacklist screening and escrow coordination into a single transfer process, which some teams may prefer over coordinating each step in-house.

Bringing it together

Cities can scale connected services without service disruption by treating IPv4 as governed infrastructure. Forecast real need, respect the policy differences across ARIN, RIPE NCC, and APNIC, and choose a procurement route that fits your risk tolerance and procurement rules. A specialist such as Brander Group can be part of that route when a city wants outside help with sourcing, screening, and transfer coordination. However you proceed, verify ownership and reputation before you pay, then harden routing with RPKI, IRR, and a geofeed before cutover.

Paired with an IPv6-first plan for new services, a careful IPv4 acquisition keeps citizen-facing systems reachable, secure, and ready to grow. That combination of policy-compliant purchasing and strong routing hygiene is what turns a one-time buy into durable digital infrastructure.