How to Buy IP Addresses
A Practical Guide for Growing Websites

Buying IP Addresses is not just for large ISPs. A U.S.-based site owner or DevOps team can acquire a clean /24 block, or 256 addresses, through a compliant transfer and deploy it across AWS, Azure, or Cloudflare in 30 to 45 days.

The project has four jobs: understand transfer policy, vet the block, close the transfer, and prepare your routing and cloud setup. With a checklist and clear ownership, you can finish it this quarter.

Critical Points

• • Owning a clean /24 gives you control over routing, deliverability, and migrations, but only if you vet and operate it well. The minimum ARIN transfer size is a /24. Recipients need a Registration Services Agreement, an operational network, and pre-approval based on projected 24-month need.
• • Budget roughly $6,400 to $9,000 for a clean /24 in 2026, based on secondary market rates near $25 per IP. Reputation history, geolocation, and block condition affect final pricing. Market rates fluctuate; verify current prices with multiple brokers.
• • Cleanliness is non-negotiable. Verify ownership through RDAP, screen every address through Spamhaus and Cisco Talos, and review prior routing history before you sign. Day-one operations include RPKI and IRR. Create Route Origin Authorizations, enable ARIN's IRR auto-manager for route objects, and stage BYOIP with your cloud or CDN provider.
• • Measure success with routing, reputation, and business metrics. Confirm RPKI validity, watch inbox placement, and track reduced vendor lock-in over time. IPv6 is accelerating, but IPv4 still matters. Google measured approximately 50 percent IPv6 usage in April 2026, yet email and legacy integrations still lean heavily on IPv4.

What Does "Buying IP Addresses" Actually Mean?

Buying IPv4 means taking over registered usage rights through an ARIN-recorded transfer, not purchasing the addresses outright. You do not buy numbers from a registry the way you buy a domain. You acquire usage rights through a policy-compliant transfer recorded by a Regional Internet Registry.

In the United States, that registry is ARIN. ARIN maintains the authoritative record of who holds each block. Holders can transfer space to qualified recipients, and brokers or marketplaces match buyers with sellers.

A /24 is the smallest independently routable IPv4 block, with 256 addresses. A ROA is a Route Origin Authorization that binds your prefix to your ASN. RPKI, or Resource Public Key Infrastructure, is the system networks use to validate that ROA. RDAP is ARIN's modern registration-data interface, which replaced legacy WHOIS. The NRPM is ARIN's Number Resource Policy Manual, the rulebook for every transfer. In the ARIN region, policy 8.3 covers in-region transfers and 8.4 covers inter-RIR transfers.

Big Benefits of Owning IPv4

Owning IPv4 gives you portability, cleaner reputation control, and a more predictable cost model. The gains show up fast in migrations, email, and budget planning.

• • 1. Provider Independence And Portability: Bring your own IP, or BYOIP, lets you move workloads between hosts, regions, and CDNs without changing addresses. That keeps DNS records and firewall allow-lists stable and cuts migration time.
• • 2. Deliverability And Reputation Control: A dedicated block means your sender reputation belongs to you. If you inherit mild prior abuse history, you can remediate it directly because blocklist owners usually want the registered IP holder to file removal requests.
• • 3. Cost Predictability And Asset Value: Buying blocks in a finite cost instead of an open-ended monthly lease. For a finance team planning steady growth and fixed endpoints, ownership simplifies forecasting and creates a real asset on the balance sheet.

How to Choose the Right IPv4 Block

Most growing sites should start with a clean /24 and buy more only when a 24-month forecast clearly supports it. A single /24 covers most Ecommerce backends, transactional email, and application endpoints. Multi-region SaaS operators may need a /23 or /22, but buying too much too early ties up cash and adds cleanup work.

Current secondary market benchmarks place average prices near $25 per IP, with clean /24 blocks trading from approximately $6,400 to $9,000. Clean reputation, accurate geolocation, and stable prior use usually command a premium. Market conditions fluctuate; solicit quotes from multiple vendors to confirm current rates.

Before you sign, collect the seller's ARIN Org ID, the ASN, or autonomous system number, you will originate from, and evidence of need such as traffic growth or customer assignment plans. Your contract should also include indemnity language for prior abuse, escrow terms, and clear acceptance tests.

Where to Buy: Channels and Vetting

The safest path is a reputable seller with clear paperwork, clean history, and solid ARIN transfer support. Use reputable brokers, established marketplaces, or direct holder transfers, then complete the move through ARIN's 8.3 or 8.4 process. Prioritize vendors who provide documented blacklist reports and help with ARIN paperwork.

Accredited Brokers. Services that specialize in IPv4 transfers handle the full workflow, from seller qualification through ARIN filing to post-transfer routing setup. They typically provide comprehensive blacklist reports covering all addresses in a block and reduce the time you spend validating seller records and chasing documentation. This consolidated approach is most helpful when you need fast approval and want to avoid managing multiple vendor relationships.

Established Marketplaces.Online platforms list available blocks with seller information and basic details. You handle more of the vetting and ARIN coordination yourself, but marketplaces offer transparency and broader inventory access.

Direct Private Deals.Acquiring space directly from a holder can offer favorable terms but requires more legwork. Validate ownership through RDAP, confirm chain of custody, and avoid blocks with suspicious routing history.

RIR Waitlists.ARIN maintains a waiting list for new allocations, but availability is limited and the process can stretch over months or years. Not practical for growth-stage demand.

Step-by-Step: The ARIN Transfer Workflow

A smooth transfer depends on preparation, clean seller records, and careful post-approval routing work. The sequence below keeps approvals moving and limits surprises after the registry update.

Step 1: Pre-Approval (1-3 days)

Document your projected 24-month need through ARIN's transfer pre-approval process. Gather your Org ID and ARIN points of contact, called POCs. The minimum transfer size is a /24, and larger requests must show 50 percent utilization within 24 months. Pre-approval applies to both 8.3 (in-region) and 8.4 (inter-RIR) transfers.

Step 2: Seller Selection (1-2 days)

Request RDAP ownership proof, blacklist report snapshots, and historical BGP, or Border Gateway Protocol, announcement data. Walk away if the seller cannot produce them quickly.

Step 3: Agreement And Escrow (1-3 days)

Define deliverables, timelines, and acceptance tests in writing. Use escrow so funds release only after ARIN confirms the registry update.

Step 4: Submit 8.3 Or 8.4 Forms (1-2 days)

Both recipient and source file with ARIN. Pay the required fees and answer any NRPM 8.5 justification questions fast, because slow replies can stall the deal. ARIN policy 8.3 covers in-region transfers (typically 30-45 days from filing to approval), while 8.4 covers inter-RIR transfers (typically 60-120 days due to multi-registry coordination).

Step 5: Post-Approval Registry Updates (1-2 days)

Confirm the netblock shows your organization in RDAP. Verify that contact records are correct before anyone tries to route or delist the space.

Step 6: Security And Routing (3-7 days)

Create ROAs in ARIN Online, enable ARIN's IRR auto-managed route objects, and stage announcements with your transit provider or CDN. Validate an RPKI Valid state before production cutover.

Overall Timeline: In-region 8.3 transfers typically close in 30 to 45 days from initial seller contact through RDAP confirmation. Inter-RIR 8.4 transfers add cross-registry coordination and can stretch to 60 to 120 days.

Due Diligence for Buying Clean IPv4 Space

Reputation checks and ownership checks matter as much as price, because cleanup work can erase any discount.

Ownership And Dispute Check

Run an RDAP lookup on the netblock. Confirm the organization name matches the seller and that no dispute notes appear.

Reputation Screening

Check sample IPs through Spamhaus Reputation Checker and Cisco Talos. Ask for a full blacklist report that covers all 256 addresses, and verify that reverse DNS does not show suspicious entries. A comprehensive report covering all major blocklists (100+ sources) helps identify remediation priorities before transfer closes.

Routing History

Review past BGP announcements and origin ASNs. Look for anomalies such as unrelated origin networks or brief, hijack-like announcements.

Geolocation Plan

Prepare an RFC 8805 geofeed, which is a plain-text file that tells geolocation providers where your IPs are used. Submit corrections to providers such as MaxMind so customers do not see the wrong locale or tax region.

Acceptance Test

Set pass and fail criteria in your contract. At a minimum, require no active critical blocklist entries, updated RDAP ownership, and ROA and IRR records ready for creation.

BYOIP Deployment Patterns: AWS, Azure, Cloudflare

Your block becomes useful only after you can announce it cleanly through the platforms that run your traffic.

AWS

Amazon EC2's BYOIP program allows accounts to bring multiple IPv4 ranges per region (verify current limits with AWS documentation). Allocate by region, test failover paths, and confirm advertisements propagate before you shift production traffic.

Azure

Use Custom IP Prefix and create a ROA that authorizes Microsoft's ASN to originate your range. Plan region-specific bindings and verify derived public IPs before cutover. Refer to current Azure documentation for specific support details.

Cloudflare

Enterprise BYOIP supports IPv4 block onboarding starting with a /24 minimum (verify current support with Cloudflare documentation). Bind the prefix to CDN and Spectrum services. BGP convergence typically completes within 10-30 minutes, with full global visibility across all networks within 1-2 hours.

Cutover Checklist

Stage allowlists, update PTR reverse DNS and MX mail routing, publish SPF, DKIM, and DMARC records, confirm health checks, and document a backout plan. Blue-green tests help, but only if rollback steps are written down first.

Operational Hardening and Hygiene

RPKI, IRR, and steady hygiene keep your routes trusted and your sending reputation stable.

RPKI

Create ROAs with a sane maxLength in ARIN Online. That gives networks cryptographic proof that your ASN is allowed to originate the prefix, which helps prevent route hijacking. Monitor validity every week.

IRR

Publish route and as-set objects through ARIN's Internet Routing Registry, or IRR. Enable the IRR auto-manager so route objects stay aligned with your ROAs.

Email Warmup

Ramp sending volume gradually. Authenticate with SPF, DKIM, and DMARC, then watch bounce and complaint rates closely. If you inherit mild prior abuse history, start delisting work early.

Geolocation And Reputation

Host a signed geofeed, submit it to MaxMind, and recheck reputations each month. Track abuse tickets and keep ARIN contact records validated.

Costs, Timelines, and Risks

A /24 is affordable for a growing business, but the real budget includes staff time and ongoing maintenance. A /24 purchase plus ARIN fees and broker costs usually lands between $7,000 and $11,000 all in. That number can rise if you pay a premium for unusually clean history or specific geolocation needs. Market rates for IPv4 blocks fluctuate based on supply, demand, and reputation; always solicit multiple quotes to verify current pricing.

In-region 8.3 transfers often close in 30 to 45 days. Inter-RIR 8.4 transfers add cross-registry coordination and can stretch to 60 to 120 days, so build slack into your plan. The biggest risks are inherited blocklist issues, RPKI invalid states from bad ROAs, stale IRR data that triggers route filtering, and incorrect geolocation. Each risk is manageable if you do the checks and cleanup work before cutover.

Make Your IPs Work for You, Not Against You

IPv6 is rising fast, but clean IPv4 still supports core systems that cannot move yet. Google's measurement data showed approximately 50 percent IPv6 usage in April 2026. Even so, email deliverability, legacy integrations, and third-party services still depend heavily on IPv4 control.

The practical stance is dual-stack, which means IPv4 and IPv6 run side by side. Keep a right-sized, clean IPv4 block for systems that still need it, and design new services so IPv6-only surfaces are possible later.

Own the block, secure it with RPKI and IRR, deploy it through BYOIP, and measure the results. That turns IPv4 address management into an advantage instead of an operational liability.

Getting Help With the Transfer Process

While the steps above are clear and many teams execute them independently, consolidating the workflow, seller qualification, blacklist verification, ARIN filing coordination, and post-transfer routing setup, under one vendor saves time and reduces errors.

Accredited IPv4 brokers handle this end-to-end process. They maintain relationships with sellers across multiple RIRs, provide detailed blacklist reports against 100+ data sources, manage ARIN documentation, and coordinate with your cloud provider or transit team on day-one routing setup.

This approach is most helpful when you're new to IPv4 transfers or when speed matters. Many teams find that working with professionals who specialize in helping organizations buy IP addresses can simplify the entire journey from initial planning through post-transfer validation.

When evaluating brokers, look for those who:

• • Provide transparent blacklist reports before you commit to purchase
• • Offer ARIN pre-approval guidance
• • Supply written escrow terms and acceptance tests
• • Coordinate directly with ARIN on your behalf
• • Support post-transfer routing validation

A good broker turns a 60-90 day DIY project into a 30-45 day managed process.

IP Addresses: Frequently Asked Questions

What's the Smallest Practical Block to Buy?
A /24, which is 256 addresses. This is ARIN's minimum transfer size under NRPM 8.5 and the smallest prefix most networks accept in BGP routing tables.

How Do I Prove I'm Allowed to Receive Space?
Use ARIN's transfer pre-approval process. You document a 24-month projected need, hold a Registration Services Agreement, and operate an active network. Pre-approval applies to both 8.3 and 8.4 transfers.

How Do I Avoid Buying Dirty IPs?
Require blacklist reports that cover every address in the block. Run your own checks through Spamhaus and Cisco Talos, and define acceptance tests so funds release only after the block passes.

Do I Need RPKI and IRR?
Yes. ROAs help prevent route hijacking, and more networks now enforce Route Origin Validation. IRR objects express your routing policy to peers and upstream filters, and ARIN's auto-manager helps keep the records consistent.

When Should I Lease Instead of Buy?
Leasing makes sense when your time horizon is under 12 months, cash is tight, or usage is bursty. Buying works better when endpoints must stay fixed, growth is steady, and recurring lease costs keep piling up.

Will IPv6 Make Buying IPv4 Pointless?
Not yet. Global IPv6 usage recently reached approximately 50 percent, but critical deliverability systems and plenty of legacy tools still depend on IPv4. Plan for dual-stack and keep moving toward IPv6 while maintaining IPv4 control where it still matters.

Summary

Buying a clean IPv4 /24 gives you control, reduces vendor lock-in, and improves deliverability. The process is well-defined, the costs are predictable, and the timeline fits a quarterly project.

Start with clear ownership goals, vet your seller thoroughly, and invest time in day-one routing hygiene. A /24 is an asset that earns its cost back through stability and control.

Author Bio: Tadeusz Kehan

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