How to Buy IPv4 Addresses for a Data Center
Data centers occupy a unique position in the IPv4 market. Unlike ISPs who assign addresses to end users, data centers use IP space to support customer allocations, infrastructure management, and inter-datacenter connectivity. The scale and nature of these requirements make the purchasing process distinct from other buyer categories. This guide covers everything you need to know.
How many IPs does a data center typically need (block size guide)
Data center IP requirements fall into two categories: infrastructure IPs and customer-facing IPs. Infrastructure IPs cover management interfaces, out-of-band access, storage networks, and hypervisor hosts. Customer-facing IPs are allocated to tenants for their servers, load balancers, and public services.
A small colocation facility with 50-100 customer racks may operate adequately with a /21 (2,048 addresses) for customer allocations plus a /24 for infrastructure. A mid-scale data center with hundreds of racks and multiple thousands of servers typically needs /19 to /18 allocations (8,192 to 16,384 addresses). Hyperscale facilities plan in units of /16 or larger.
When sizing, factor in: your allocation ratio to customers (most customers need a /29 to /26 per server cluster), overhead for routing and management, and your growth projection over 3-5 years. Data centers that under-provision IP space face significant operational disruption when they need to renumber customer assignments.
Multi-site operators should plan separately for each facility and consider whether to use a single aggregate block announced from multiple locations or distinct blocks per site.
RIPE vs ARIN vs APNIC - which region to buy from
For data centers operating in Europe, RIPE space is the standard choice. RIPE addresses are expected by European peers and customers, and transfers within RIPE are well-established. If your facility is in Prague, Vilnius, or another EU city, your customers will expect RIPE-allocated addresses.
ARIN space is appropriate for North American operations. Some European data centers acquire ARIN space as a secondary pool to serve customers with North American routing preferences, but this adds administrative overhead.
If you serve customers who specifically need addresses from a particular registry region for regulatory or routing reasons, factor this into your purchasing plan. DCXV as AS204057 has experience routing space from all three major registries.
For multi-site data center operators, consider whether a single RIR membership simplifies operations versus acquiring region-specific space for each location.
How to verify a clean IPv4 block before buying
For a data center, a dirty IP block creates immediate customer-facing problems. Customers deploying mail servers, web applications, or CDN nodes will encounter delivery failures and content filtering if their assigned IPs carry abuse history.
Run the block through MXToolbox bulk blacklist check, Spamhaus Zen, SURBL, and URIBL. Check BGPView or RIPE Stat for routing history - a block that has been consistently routed by reputable ASNs is preferable to one with gaps or associations with known bad actors.
Check abuse.ch feeds and AbuseIPDB for any recent abuse reports against IPs in the block. Query WHOIS for the block’s complete history. Verify the seller is the current legitimate holder and not reselling space they acquired themselves with unresolved issues.
For large block purchases (/20 and above), consider a phased due diligence: check a sample of IPs across the entire range to identify any sub-ranges with concentrated abuse history.
Broker vs direct transfer - risks and benefits
Direct transfers between data centers are possible when both organizations have RIR accounts and staff experienced with the transfer process. Direct deals can be faster when both parties are cooperative and documentation is clean, but they require you to manage verification, legal review, and escrow arrangements independently.
Working with an accredited broker is strongly recommended for data centers purchasing /20 and larger blocks. At this scale, the financial exposure of receiving a dirty or legally disputed block justifies the broker fee. A qualified broker handles ownership verification, background checks on the block, escrow, and RIR submission - reducing your operational risk significantly.
DCXV is an approved broker with RIPE NCC, APNIC, and ARIN. We specialize in larger block transactions and can coordinate multi-registry purchases for multi-site operators. Contact ipv4@dcxv.com to discuss your requirements. https://dcxv.com/ipv4
Current market pricing and timeline (ranges only)
Block pricing varies by size, registry, and market timing. Larger blocks trade at lower per-address prices than smaller blocks, which creates an incentive for data centers to purchase in aggregate. Timing matters - market conditions shift based on the volume of available listings and competing demand.
RIPE transfer completion typically takes 2-4 weeks for straightforward transactions. ARIN transfers run 3-6 weeks. Bulk purchases involving multiple blocks or multi-registry coordination can take longer.
For accurate pricing on the block sizes relevant to your facility, and for a timeline estimate based on current market conditions, contact ipv4@dcxv.com. We provide no-obligation quotes and can advise on structuring larger purchases to optimize cost. https://dcxv.com/ipv4
