IPv4 has a fixed address space, and obtaining usable public addresses can create a material infrastructure cost. Scarcity can put upward pressure on prices, but quotations vary by market, block size, terms and time; this guide does not establish a current market surge. Whether you manage a VPS, a fleet of dedicated servers or a multiregion service, distinguish address acquisition prices from the recurring IPv4 charges in your hosting contract. This guide covers address inventories, billing, shared gateways, private networking and IPv6 compatibility, followed by an illustrative 12-month plan. The scenarios are hypothetical, and potential savings must be checked against the billable allocation and migration costs.
Why IPv4 Scarcity Can Push Prices Up
The hard limit: 4.3 billion addresses, no more
IPv4 provides about 4.3 billion unique addresses. That sounded enormous in the 1980s, but today we have billions of smartphones, IoT devices, virtual machines, containers and microservices. Not all of these addresses are available for public use, and not every device or workload needs its own public IPv4 address. Allocation availability and restrictions differ across Regional Internet Registries (RIRs), including RIPE NCC, ARIN, APNIC, LACNIC and AFRINIC. Growing networks may need to obtain IPv4 through transfers or leases rather than rely on new RIR allocations. Scarcity can push prices up, but available resale supply and demand also change.
From free resource to traded asset
Some organizations hold IPv4 space acquired under earlier allocation policies, and mergers, closures or network changes can leave addresses available for reuse. Where current RIR policies permit, registered address resources may be transferred between organizations through the applicable process. Brokered transactions, auctions and leases are different commercial arrangements; a payment or contract alone does not prove that a proposed transfer is eligible or that a block will be routable by your provider.
The history of IPv4 exhaustion and transfer markets provides background on allocation and demand. A historical account is useful context, but a current budget needs dated quotations for the exact resource and terms you are considering.
Potential demand drivers: AI, edge, and workload requirements
Workload growth and connectivity requirements can add pressure in several ways:
- AI and GPU clusters may need IPv4 for externally accessible APIs or dependencies. That does not mean each node, control plane or monitoring service needs a public address.
- Edge computing and CDNs deploying nodes in more regions, often requiring at least some public IPv4 footprint for compatibility.
- Workload-specific security and audit requirements may favor dedicated addresses in some designs. Auditing, forensics and KYC/AML obligations do not by themselves establish a blanket requirement against IPv4 sharing; the applicable controls need to be assessed.
Organizations adopting IPv6 may still need IPv4 connectivity for IPv4‑only clients and dependencies, whether through their own addresses or shared gateways and proxies.
The Economics Behind the IPv4 Market
How IPv4 transfers and pricing actually work
A broker quote, completed transaction and hosting provider’s monthly rental fee measure different things. Blocks may be quoted as /24 (256 addresses), /23, /22 or larger; do not assume that every numeric address in the block is available for a host in your subnet design. Compare the price per address alongside block size, rights and term, service fees and transfer requirements. A smaller block is not automatically easier to announce or guaranteed to command a premium; confirm routing acceptance with the relevant providers.
Prices vary by region and by RIR policy. For example, ARIN and RIPE NCC each have their own rules about:
- Who can receive a transfer
- Justification of need and utilization
- How inter‑RIR transfers are handled
The ARIN transfer-policy guide offers background on policy considerations. Before committing to a transaction, check the current applicable RIR policy, eligibility, registration holder, required documentation and provider routing support. Confirm responsibilities for route authorization, reverse DNS and any operational reputation checks; do not use a historical article title as proof of today’s rules.
Why your hosting bill feels it even if you never buy IPs directly
You may obtain IPv4 through a hosting plan instead of buying a block. Check whether an address is included, separately billed or available only by request for the location and service you need. Higher acquisition or lease costs may affect a provider’s pricing, but your payable charge depends on the actual contract and any permitted changes; it does not automatically track a broker’s price index.
Depending on the provider and plan, this can show up as:
- Separate monthly fees for additional IPv4 addresses
- Smaller default IPv4 allocations on new servers
- Lower prices for IPv6‑only configurations where offered; dual‑stack alone does not reduce the number of IPv4 addresses used
Record the included allocation, additional address charge, setup fees, minimum term and release conditions. If the included IPv4 price is not separately stated, mark that component as unknown instead of inventing a value. Releasing an included address may improve capacity efficiency without reducing that package’s invoice.
Speculation vs. real demand
Some holders may delay selling resources in expectation of future returns, while networks still require IPv4 for clients or dependencies. The relative contribution of speculation is not established here. Budget with explicit price assumptions and updated quotes rather than treating scarcity as proof of continuous price increases.
As long as a significant share of the internet remains IPv4‑only, and as long as some critical partners or customers require IPv4 connectivity, that demand will persist. The market can cool or heat up in cycles. The address space remains finite, but future prices depend on demand, resale supply and the pace of IPv6 adoption.
How IPv4 Charges Affect Different Architectures
Scenario 1: An agency juggling dozens of small sites
Imagine a digital agency hosting 80–100 client sites on a mix of shared hosting and small VPS instances. Historically, you might have used separate IPv4 addresses for:
- Each white‑label reseller hosting environment
- SSL certificates back in the early SNI‑less days
- “Reputation isolation” for clients sending marketing email
Depending on the contract, 20–30 additional IPv4 addresses could be costly. For compatible HTTPS clients and a correctly configured server, SNI lets multiple site names use one address while presenting appropriate certificates. Keep each site’s access controls and workload isolation; sharing an IP does not create tenant isolation, and a separate IP does not by itself provide it. Shared outbound mail also shares sending-IP reputation. The guide to addon domains and separate cPanel accounts examines account separation; confirm the mail and customer allowlist requirements before consolidating addresses.
Scenario 2: A SaaS platform growing faster than its IPv4 plan
Now picture a SaaS product that started with a single /24 from its provider and used one IPv4 per tenant for whitelisting and firewall rules. As the number of tenants grows, there could be pressure to add more /24s; assume in this scenario that the provider now charges more than it did at launch. This affects:
- Pricing models (per‑tenant IPv4 becomes hard to justify)
- Architecture (evaluating shared IPs with authenticated tenant identification and enforced authorization; headers or tokens alone do not replace network isolation or customer IP allowlists)
- Onboarding experience (educating enterprise customers about IPv6, NAT and shared IP architectures)
In this scenario, redesigning internal routing and multi‑tenant architecture could allow logical tenant separation without 1:1 IPv4 mapping, where customer connectivity requirements permit it. Our post “Multi‑Tenant Architectures for SaaS Apps” covers patterns that reduce the need for per‑tenant public IPs.
Scenario 3: Colocation customers with legacy IPv4 habits
Consider a hypothetical colocation network whose historical design assumed “IPs are cheap”:
- Every server with multiple public IPv4s for “future use”
- Extremely sparse subnetting (e.g., /24 per small rack)
- No NAT or private address spaces for internal services
If IPv4 charges rise, re‑addressing this hypothetical environment may become financially attractive. Renumbering a rack from several /24s down to a more efficient set of subnets can free addresses for reuse, but recurring costs fall only if the billable allocation or lease is reduced. Teams can also consider dual‑stack designs and private addressing plus NAT where public IPs are not strictly required; adding IPv6 alone does not reclaim IPv4 addresses.
Technical Strategies to Reduce Your IPv4 Dependence
1. Audit and reclaim wasted IPv4 allocations
Before acquiring more space, identify assigned, active, reserved and billable IPv4 addresses. Low observed traffic does not establish that an address can be released: it may serve failover, scheduled jobs, partner allowlists or infrequent integrations. For each candidate, verify its owner and remaining dependencies:
- List all subnets and their actual usage
- Identify servers with multiple public IPs where one would suffice
- Check historic assignments for projects that no longer exist
- Look for “reserve” or “just in case” addresses that were never put into production
Reclaim addresses only after DNS, listeners, NAT rules, outbound allowlists, mail and recovery dependencies have been migrated or removed. Preserve a rollback route while testing, and follow the provider’s release process. Reuse can avoid buying additional capacity; cash savings depend on whether the billable allocation or lease actually falls.
2. Move internal services to private addressing
If internal‑only services use public IPv4 addresses, consider whether private connectivity could replace those assignments. Typical candidates for migration to private IP space include:
- Database servers (MySQL, PostgreSQL, etc.)
- Internal caches and queues (Redis, RabbitMQ, Kafka)
- Monitoring and logging clusters
- Configuration management and CI/CD nodes
Private VLANs, VPNs or suitable overlay networks can connect these services using nonpublic addressing, with RFC1918 ranges where appropriate. Match the actual overlay’s addressing scheme and avoid overlapping networks. Private addresses and NAT are not substitutes for authentication, firewall policy and workload isolation. The private-overlay networking guide provides related design context. Release a public address only after all remaining paths and dependencies have been checked.
3. Use IPv4 NAT more strategically (without going overboard)
Address-and-port translation can let multiple internal systems initiate connections through a smaller public IPv4 pool. Whether that reduces total cost depends on the gateway, required resilience, traffic charges and operational work as well as the address fee:
- Outbound clients: API calls, updates and build agents may share egress, subject to destination allowlists, per-IP rate limits and reputation requirements.
- Internal service traffic: private IPv4 or IPv6 can carry east-west connections without an Internet-facing address for each workload.
- Gateway design: shared egress needs sufficient session and port capacity, monitoring and a failure/recovery design appropriate to the service.
Monitor translation-table usage, port pressure and failed connections. Where session attribution is required, retain the protocol, internal identity, translated source address/port and accurate time information needed for that purpose, with suitable access and retention controls. A source IP alone cannot identify one workload behind shared egress. Inbound publication is a separate requirement: configure a reverse proxy, gateway or deliberate port mapping for the protocols that need it.
4. Add Dual-Stack Where Compatibility Requires It
Dual‑stack means your services are reachable over both IPv4 and IPv6. It lets compatible clients use IPv6, but shifting traffic alone does not reduce the number of IPv4 addresses you pay for. Savings require reclaiming or consolidating public IPv4 assignments as compatibility allows. Practical steps:
- Confirm IPv6 availability and addressing for the selected location and service.
- Configure the network route, service listener, certificates and firewall policy; test IPv6 before publishing AAAA records.
- Verify reverse proxies and application dependencies over both families, including explicit IPv4-only tests where compatibility is required.
- After DNS publication, monitor reachability and application errors from relevant networks; retain a documented rollback path.
The IPv6 adoption and migration guide covers staged rollout. A working AAAA answer alone does not prove that the application, TLS or its dependencies are reachable over IPv6.
5. Consider IPv6‑first and IPv6‑only components
Some workloads can run IPv6‑only if their clients and dependencies support IPv6, or suitable proxies or translation provide access to IPv4‑only dependencies. Candidates include:
- Internal microservices behind a load balancer or API gateway
- CI/CD runners, build agents, and internal dashboards
- New staging or test environments where you fully control client access
For web ingress, an IPv4-capable reverse proxy or CDN can connect to an IPv6-only origin if that path is explicitly supported and configured. Ordinary DNS64/stateful NAT64 instead helps an IPv6-only client initiate connections to an IPv4 server. It does not automatically expose an IPv6-only backend to arbitrary IPv4 visitors; IPv4-initiated NAT64 communication needs deliberate bindings or another supported traversal design. Test actual dependencies, including clients using literal IPv4 addresses and DNSSEC validation arrangements. The IPv6-only hosting guide provides further context; do not assume that adding DNS64 repairs every application.
Planning an IPv6‑First Future Without Breaking Existing Services
Change the way you think about IP addresses in architecture design
Treat public IPv4 assignments as explicitly justified resources. Customer network allowlists, protocol requirements and application authorization are different constraints. During design review, ask:
- “Does this service really need its own public IPv4, or just TCP connectivity?”
- “Can we terminate IPv4 once at a gateway and run the rest of the path over IPv6 or private IPv4?”
- “Is tenant or customer identity tied to IP addresses when it could be tied to validated certificates or tokens, or identity headers set by a trusted gateway instead?”
Shared gateways can reduce per-workload public assignments when the connectivity contract permits it. Validate tenant identity and authorization at the application boundary; a client-supplied header or an IP address alone is not an authorization policy. Preserve any required customer network restrictions and test them after the change.
Make IPv6 a first‑class citizen in new projects
Every new project is an opportunity to reduce exposure to future IPv4 cost increases. For greenfield apps and sites:
- Ensure the app fully supports IPv6 in its config, logging and security rules.
- Design firewall rules with IPv6 in mind from day one.
- Document procedures for rotating IPv6 addresses if needed.
- Confirm your third‑party integrations and SaaS partners handle IPv6 gracefully.
Document these requirements while designing a new service, then include IPv4 and IPv6 cases in deployment checks. IPv6 address availability does not establish application readiness or remove operational costs.
Update monitoring, logging and security to handle IPv6 properly
Adopting IPv6 is not just about adding AAAA records. Your observability and security stack must understand the new reality:
- Store IPv4 and IPv6 correctly in application logs and attribution records.
- Apply firewall, WAF and rate-limit policies to the intended IPv6 prefixes and identities; do not blindly reuse IPv4 prefix lengths or assume one IPv6 address represents one user.
- Check monitoring and threat-data support for both families, including the actual client identity forwarded by trusted proxies.
If email is part of your stack, our guide “Email Deliverability over IPv6” is a practical reference to avoid surprises.
Model Address Charges and Total Migration Cost
Use the same budget period for the baseline and proposed architecture. Sum separately billed IPv4 charges and spread one-time setup costs across that period where useful for comparison. Keep included package charges in the package total so they are not counted twice. Track:
- Assigned and billable IPv4 counts, included allowances and minimum commitments.
- Recurring fees, one-time fees, release terms and the date of each quote.
- Expected growth and explicitly hypothetical lower, unchanged and higher price scenarios.
- Gateway, proxy, transfer, migration, monitoring and ongoing operating costs in the proposed design.
Compare complete architectures, not just per-address prices. Show a sensitivity estimate separately from the actual invoice, and avoid claiming savings until assignments have been consolidated and billing terms confirmed. The related IPv4 cost and scarcity guide offers background. The following plan is an adaptable example, not a guaranteed schedule or percentage saving.
An Illustrative 12-Month IPv4 and IPv6 Plan
- Months 1–2: inventory addresses, owners, dependencies and charges. Establish the baseline and choose a feasible target from measured capacity rather than a universal saving percentage.
- Months 3–4: remove confirmed obsolete dependencies, consolidate compatible HTTPS sites or proxy ingress, verify operation and only then release unused billable addresses.
- Months 5–6: review mail and other sensitive services. Check allowlists, sending-IP reputation, forward/reverse DNS and authentication; retain separate addresses where justified.
- Months 7–9: pilot IPv6 on a low-risk service. Verify routing, listeners, firewalls and dependencies before publishing AAAA. Provide a tested IPv4 ingress path for IPv6-only web origins where needed.
- Months 10–12: document allocation and release rules, monitoring and recovery ownership. Compare actual address counts, invoices, reliability and operating effort with the baseline.
Adjust the sequence to service risk and delivery capacity. Review costs and availability during the rollout rather than waiting until the end of the example year.
Questions to Resolve with Your Hosting Provider
Confirm Allocation, Billing and Support Responsibilities
The planning goal is to reserve just enough IPv4 for services that still need it—endpoints serving IPv4‑only clients, legacy integrations and reputation‑sensitive email—and use IPv6 or private addressing where compatible.
For a VPS, dedicated server or colocation proposal from DCHost or another provider, confirm what the selected plan supports and who will perform each change:
- Included and additional IPv4 allocations, current fees, minimum terms and release conditions.
- IPv6 availability for the actual location and plan; routing, reverse DNS and control-panel support where needed.
- The supported scope of proxy, NAT, migration and rollback assistance, with responsibility for application testing clearly assigned.
Check IPv6 readiness before scaling
Before choosing a platform, confirm IPv6 support for your location and plan, including:
- Dual‑stack connectivity on VPS and dedicated servers where supported
- IPv6‑capable network equipment and routing policies
- Support for IPv6‑only workloads and any required NAT64/DNS64 egress
Shared load balancers with private or IPv6-only backends can reduce per-workload public assignments where protocols and client requirements permit. Evaluate caching for traffic reduction separately from address savings. Before migrating, measure performance, verify the IPv4 ingress and backend path, and confirm that you can remove the old billable assignments without losing required access.
Use the Inventory to Guide the Next Change
IPv4 prices may rise, remain stable or fall; the address space is still finite. A useful modernization decision therefore rests on measured usage, current contract terms and compatibility requirements, rather than a prediction of permanently rising prices. Prioritize changes that improve the documented design:
- Clean up unused IP allocations and simplify your topology
- Introduce dual‑stack or IPv6‑only zones in safe, controlled ways
- Align your budget planning with a realistic view of IPv4 scarcity
Start with the address inventory and one bounded pilot, then compare actual operation and total cost before expanding it. If you seek provider assistance, bring the allocation list, connectivity requirements and proposed changes, and confirm the available support scope. An efficient IPv4/IPv6 design can reduce unnecessary address use, but neither IPv6 adoption nor a smaller address count guarantees a lower overall bill or interruption-free migration.
