If you run a multi-cloud stack, you already know the pain: hard-coded allowlists, vendor IP churn, rising public IPv4 fees, and the constant dance between compliance and velocity. The clean way to keep your reputation, preserve partner allowlists, and control costs is to standardize on leased IPs that you can route consistently across AWS, Azure, and Google Cloud.

This guide walks you through how leased IPs fit into each cloud’s Bring-Your-Own-IP feature, common patterns that actually scale, the guardrails legal teams expect, and fresh market numbers so your business case is solid.

How BYOIP works in each cloud

BYOIP stands for Bring Your Own IP. It’s a cloud feature that lets you use your own public IP address ranges, including leased IPs, inside a cloud provider’s network (AWS, Azure, or Google Cloud) instead of using IPs the provider assigns.

Every provider supports some version of BYOIP. The through line: clouds need to verify you control the prefix, and they may require RPKI Route Origin Authorizations and specific RDAP or LOA steps.

• • AWS: You import your range into EC2 as a BYOIP pool, prove control, and optionally announce via AWS. AWS documentation outlines prerequisites like adding RDAP comments and creating a ROA at your RIR.
• • Azure: Use Custom IP Address Prefix to bring a contiguous range that Microsoft is permitted to advertise, then allocate those IPs to public resources.
• • Google Cloud: Create a Public Advertised Prefix and import your range. Google warns against overlapping announcements, which matters when your lessor also advertises parts of the same space.

If you use leased IPs, make sure your provider supplies a current Letter of Authorization and supports RPKI so you can create ROAs that allow the cloud’s ASN to originate the route. ARIN also notes providers monitor ROA repositories, and some platforms require valid ROAs.

Architecture patterns that scale

Here are patterns we see succeed across teams using leased IPs in multi-cloud.

1. Static egress IPs for APIs and partner allowlists

• • Allocate leased IPs to managed NAT or load balancers per region.
• • Keep the same IPs across clouds so partners only manage one allowlist.
• • Prefer regional segmentation so an incident on one prefix does not impact global traffic.

2. Blue-green cloud cutovers

• • Announce your leased IPs via Cloud A while pre-provisioned in Cloud B.
• • Shift BGP advertisement to Cloud B during cutover with minimum DNS changes.
• • Maintain TLS certs and allowlists bound to the leased IPs rather than provider IPs.

3. Reputation control for outbound messaging and scraping

• • Assign unique leased IPs per tenant or per workload class.
• • Track deliverability or block-list signals per IP, rotate methodically, and use RPKI to prevent route hijack that could poison reputation.

4. Centralized IP lifecycle with IPAM

• • Treat leased IPs as first-class inventory in IPAM.
• • Track cloud attachment, lease end dates, RPKI status, ROA expirations, and abuse tickets.

Step-by-step: Integrating leased IPs on AWS

1.Gather docs from your lessor

• • LOA authorizing you and the cloud ASN to originate the prefix.
• • Confirmation of RIR allocation and who manages RPKI.

2.Prepare RPKI and RDAP

• • Add the self-signed certificate to RDAP comments, create a ROA at the RIR to include the AWS ASN you will use. Follow AWS prerequisites closely.

3.Provision BYOIP

• • Import the range into EC2 BYOIP. After validation, it shows as an address pool.

4.Attach to services

• • Allocate addresses to Elastic IPs, NLBs, or Global Accelerator. Keep one-to-one mapping for critical APIs to avoid churn during failover.

5.Optimize cost and controls

• • You will not pay the AWS public IPv4 hourly fee for addresses you bring, which helps your business case. Build guardrails to avoid accidental use of billed cloud-owned IPs.

Step-by-step: Integrating leased IPs on Azure

1.Validate ownership and authorization

• Confirm your lessor’s LOA allows Microsoft to advertise the range.

• Ensure RPKI ROAs cover Microsoft’s required origin ASN. Azure monitors ROA state.

2. Create a Custom IP Address Prefix

• Import the prefix into your subscription. After approval, you can use it like Azure-owned space.

3. Bind to public endpoints

• Assign addresses to Public IP resources, Application Gateways, or Front Door as needed.

• Standardize on Standard SKU Public IP for consistency across regions. Note that some services have moved pricing and SKU defaults in 2025.

Step-by-step: Integrating leased IPs on Google Cloud

1. Plan your PAP architecture

• Use a dedicated project and organization folder for BYOIP. Google recommends planning ahead.

2. Import your range

• Create a Public Advertised Prefix and import the leased IPs.

• Avoid overlap. Google does not support overlapping announcements of the same prefix from outside Google if you import it.

3.Attach to workloads

• Assign addresses to load balancers or as persistent pod IPs with GKE if you need sticky egress identity.

4.Watch the math

• External IPv4 pricing on Google Cloud increased in 2024 for in-use addresses. BYOIP helps with control, yet you still need to model egress.

Security and reliability tips

• • RPKI first: Keep ROAs current, track expirations, and align maxLength with the subnets you will actually advertise. AWS, Azure, and some networks monitor ROAs and will flag gaps. (read more: RPKI in IP Leasing: 7 Steps for Secure Routing)
• • No overlap: If the lessor announces the prefix from their ASN while you try importing the same block, GCP will reject it, and any cloud may see routing instability.
• • Abuse desk readiness: Document an abuse workflow. Cloud providers provide channels and expect quick responses when something looks off.
• • IP hygiene: Warm up new leased IPs gradually, segment by workload risk, and keep reverse DNS aligned with use cases to protect reputation.

Compliance and policy guardrails

Using leased IPs does not exempt you from platform rules or laws. Bake these into your SOPs.

• • Cloud AUPs: AWS, Azure, and GCP all prohibit spam, abuse, or unlawful activity. Keep runbooks that map violative behaviors to enforcement steps on your side.
• • Privacy laws: For the EU/UK, apply GDPR (lawful basis, transparency, DSRs) and appropriate transfer tools for cross-border data. In the U.S., align to CPRA/CCPA and track emerging state laws with differing consent/opt-out standards.
• • Email rules: For commercial email, follow FTC CAN-SPAM guidance, including clear opt-outs and accurate sender info. Tie this to IP reputation tracking.
• • Sanctions and export: Check partners and destinations against OFAC and similar lists before you route traffic from leased IPs into restricted regions.
• • Contract terms: Make sure your lease agreement clearly states routing rights, ROA delegation, LOA format, abuse handling, and indemnity.

None of this is legal advice. Work with your counsel to adapt these controls for your industry and jurisdictions.

Cost modeling for the CFO

A simple model we see adopted:

1. Inventory: Count all public IPv4s you consume per cloud and per region.
2. Compare: Cloud-owned public IPv4 fees vs the monthly rate for leased IPs, plus any BYOIP administrative overhead. On AWS alone, BYOIP avoids the $0.005 per hour public IPv4 charge.
3. Right-size: Use smaller blocks for bursty workloads and larger blocks for steady, allowlist-sensitive traffic.
4. Scenario test: Add multi-cloud failover events, where the same leased IPs follow the traffic.

Implementation checklist

Use this as your internal runbook when you standardize on leased IPs.

Vendor and range readiness

• • Confirm lease terms allow cloud advertising and sub-allocations.
• • Get LOA naming your org and the cloud ASNs.
• • Create or update ROAs for each cloud and region.

Cloud import

• • AWS: Prepare RDAP comment, ROA, then create BYOIP pool in EC2.
• • Azure: Create Custom IP Address Prefix, then provision Public IPs from it.
• • GCP: Create Public Advertised Prefix, avoid overlapping external announcements, then assign to LBs or GKE.

Networking and controls

• • Assign leased IPs to NAT or load balancers.
• • Add monitoring for ROA validity and route reachability.
• • Implement IPAM records with owner, lease end date, and usage tags.

Compliance and abuse

• • Map cloud AUPs to internal policies.
• • Add CAN-SPAM and privacy checks to workflows where relevant.
• • Publish an abuse contact and escalate within defined SLAs.

Make it real with PubConcierge

If your roadmap includes standardizing on leased IPs across clouds, we can help with BYOIP-ready ranges, LOAs, RPKI support, and monitoring so your team spends less time chasing routing edge cases and more time shipping.

We design allocation plans that match partner allowlists, compliance requirements, and cost targets.

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Disclaimer: This article is general information and not legal advice. Work with counsel to adapt controls for your jurisdictions and industry.

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