Buy IPv4 /21 Block
2,048 {ipCount} IP Addresses
Purchase a clean, blacklist-free /21 IPv4 block with 2,048 IP addresses. Escrow-protected transactions, managed RIR transfers, and blocks available from all five registry regions.
A /21 IPv4 block contains 2,048 IP addresses and currently costs $51,200 – $71,700 ($25 – $35 per IP) on the secondary market. Prices vary by RIR region, with RIPE NCC blocks commanding the highest premiums and AFRINIC blocks being the most affordable.
Target Audience
Multi-site enterprises connecting headquarters, branch offices, and remote campuses over SD-WAN or MPLS; financial institutions requiring dedicated IP ranges per compliance zone; and healthcare networks with strict HIPAA/GDPR segmentation requirements.
Use Case
A /21 provides 2,048 addresses—the natural fit for an enterprise campus network that spans 5–20 physical locations. Each site can receive its own /24 or /25 while the entire range is announced as a single aggregate. Common deployments include corporate SD-WAN overlays, segmented compliance zones (PCI-DSS for payment systems, HIPAA for health data), and dedicated IP pools for IoT device management across warehouse and logistics networks.
/21 IPv4 Block Pricing by RIR Region
Prices vary by Regional Internet Registry. Below is a breakdown of current market rates for /21 blocks across all five RIR regions.
| RIR Region | /21 Block Price Range | Transfer Time |
|---|---|---|
RIPE NCC Europe, Middle East, Central Asia | $61,400 – $71,700 | 1–2 weeks |
ARIN North America | $57,300 – $66,600 | 2–4 weeks |
APNIC Asia Pacific | $56,300 – $64,800 | 2–3 weeks |
LACNIC Latin America & Caribbean | $53,200 – $59,400 | 3–5 weeks |
AFRINIC Africa | $51,200 – $57,000 | 3–5 weeks |
Prices reflect current market conditions and may fluctuate based on supply and demand. Contact us for a real-time quote on your specific requirements. browse marketplace. Last updated: March 2026
What's Included with Every Purchase
Every IPv4 block purchase comes with comprehensive services to ensure a smooth, secure transaction and clean address space.
Blacklist-Free Guarantee
Every block is thoroughly screened against major blacklists and spam databases before transfer, ensuring your IPs have a clean reputation from day one.
Clean BGP History
We verify that each block has no history of BGP hijacking, route leaks, or abuse reports, giving you confidence in the integrity of your new address space.
Managed RIR Transfer
Our team handles the entire inter-RIR or intra-RIR transfer process on your behalf, including all paperwork, compliance checks, and communication with the registry.
All RIR Regions
We source blocks from all five Regional Internet Registries—RIPE NCC, ARIN, APNIC, LACNIC, and AFRINIC—so you can find the right block regardless of your geographic needs.
Fast Delivery
With pre-vetted inventory and streamlined transfer workflows, most transactions complete in 1–4 weeks depending on the RIR, significantly faster than industry averages.
Dedicated Support
A dedicated account manager guides you through the entire process—from block selection and due diligence to transfer completion and post-sale network configuration assistance.
Other IPv4 Block Sizes
Looking for a different size? Explore our full range of IPv4 block offerings, from /24 (256 IPs) to /16 (65,536 IPs).
Frequently Asked Questions About /21 Blocks
Everything you need to know about purchasing a /21 IPv4 block, from pricing and transfer timelines to technical requirements.
How do enterprises typically subnet a /21 across multiple offices?
How do enterprises typically subnet a /21 across multiple offices?
A common pattern is: /24 for headquarters, /25s for large branch offices, /27s for small sites, and /28s for remote workers or IoT gateways. The entire /21 is announced as a single aggregate from the corporate ASN, while internal routing distributes traffic via MPLS or SD-WAN tunnels. This keeps the global routing table clean while allowing granular internal segmentation.
Can a /21 help with regulatory compliance like PCI-DSS or HIPAA?
Can a /21 help with regulatory compliance like PCI-DSS or HIPAA?
Yes. Compliance frameworks require network segmentation—isolating payment card environments (PCI-DSS) or electronic health records (HIPAA) from general-purpose networks. A /21 provides enough address space to create dedicated subnets for each compliance zone, each with its own firewall policies, logging, and audit trails, all within a single owned prefix.
Is a /21 large enough for an SD-WAN deployment?
Is a /21 large enough for an SD-WAN deployment?
For most mid-size enterprises with 5–20 sites, a /21 (2,048 IPs) is more than sufficient. Each site typically needs 10–50 public IPs for WAN interfaces, NAT pools, and management access. A /21 can comfortably serve up to 20 sites while reserving capacity for future expansion and lab environments.
Why is the per-IP cost the same as smaller blocks at /21 size?
Why is the per-IP cost the same as smaller blocks at /21 size?
Volume discounts on per-IP pricing typically start at the /20 threshold (4,096 IPs). At /21 size, per-IP pricing is $25–$35, matching /24 through /22 rates. Organizations that can justify a /20 purchase will see per-IP costs drop to $23–$30, making the jump from /21 to /20 a consideration for cost-conscious buyers.