BYOIP IPv4 Requirements Guide

Understanding the Basics of BYOIP

For network engineers, reputation is everything. Migrating services to the cloud often means tearing down years of careful firewall rules and whitelisting built on specific IP addresses. It is a headache. Bring Your Own IP (BYOIP) fixes this by letting you use your own IPv4 address space on cloud platforms instead of taking whatever random block the provider gives you. This capability is essential for avoiding the pain of reconfiguring firewalls, updating whitelists, and rebuilding IP-based reputations established over years. Implementing BYOIP IPv4 requirements, however, is not just a click-and-go affair. It involves strict technical validation and governance checks to ensure internet routing stability.

You need more than just ownership here. The process demands a clean routing history, proper registration in regional internet registries (RIRs), and often the implementation of Resource Public Key Infrastructure (RPKI). Before you even think about initiating a BYOIP request with a hyperscaler, make sure your IP blocks are portable, verified, and free of blacklisting.

Universal Prerequisites and RPKI

Whether you choose AWS, Azure, or Google Cloud, the ground rules do not change much. Certain foundational BYOIP IPv4 requirements apply across the board. Fail to meet these, and your advertisement request will face immediate rejection.

Regional Internet Registry (RIR) Verification

Cloud providers need proof that you are actually the authorized user of the address space. You must have a LoA (Letter of Authorization) or direct account access with the relevant RIR—be it ARIN, RIPE NCC, APNIC, LACNIC, or AFRINIC. The addresses must be registered and designated as “Portable” rather than “Provider Aggregatable” (PA) space, unless you have specific permission from the current provider to transfer them.

IP Reputation and History

Hyperscalers perform rigorous background checks on the IP block. If that /24 block has a history of spamming, botnet activity, or is listed on major DNSBLs (DNS-based Blackhole Lists), the provider will likely reject the request. They have to protect their own reputation.

RPKI and ROV Configuration

Resource Public Key Infrastructure (RPKI) is becoming a mandatory standard. To facilitate BYOIP, you must create a Route Origin Authorization (ROA) in your RIR’s portal. This cryptographic statement tells the internet which Autonomous System (AS) is authorized to originate your IP prefixes.

For BYOIP, you often need to validate that the Cloud Provider’s AS is authorized to announce your IP. This involves collaboration between your network operations team and the provider’s networking backend.

AWS BYOIP Specifics

Amazon Web Services has a structured process documented in their VPC user guide. To meet the BYOIP IPv4 requirements for AWS, you must first provision a public IPv4 address pool.

• Address Size: AWS requires a minimum of a /24 (256 addresses). You cannot bring smaller subnets like a /25 or /26.
• Verification: You must upload a signed authorization letter from the RIR confirming your right to use the addresses.
• ROA Setup: You must configure a ROA that authorizes the Amazon AS number (e.g., AS16509 or AS14618) to originate the prefix. This is a critical step to prevent route leaks.
• Limitations: Once advertised, you must use the IP addresses within an AWS VPC. You cannot use these IPs for on-premises workloads simultaneously via a different provider unless you are using complex split-horizon scenarios, which are generally discouraged.

Azure BYOIP Specifics

Microsoft Azure has slightly different workflows, primarily managed through the Azure Portal or PowerShell. The BYOIP IPv4 requirements for Azure focus heavily on the validation of the “Bring Your Own IP” capability within their custom IP address ranges.

• Prefix Size: Like AWS, Azure typically requires a /24 or larger contiguous block.
• Geo-Location: You must associate the IP block with a specific Azure region. This is crucial for latency management and compliance.
• Authorization: You need to sign a message using the private key associated with your RIR account (or the specific method prescribed by the portal) to prove ownership.
• Routing: Azure requires you to remove the BGP advertisement from your current upstream provider before they will fully adopt the prefix. This avoids “dual announcement” issues which can destabilize routing.

Google Cloud BYOIP Specifics

Google Cloud Platform (GCP) offers BYOIP through their Compute Engine and Cloud Router services. Meeting the BYOIP IPv4 requirements for GCP involves preparing the prefix and ensuring it is ready for global load balancing if required.

• Prefix Validation: Google requires that the prefix is not currently advertised by any other ASN when you initiate the request.
• Scope: The IPs are brought into a “Public delegated prefix” within your GCP project.
• Verification: Google provides a specific validation token that you must add to the “Comments” field of your RIR object (e.g., in the RIPE database). This is a unique verification method to prove control over the registration record.

Provider Comparison

While the core concept remains the same, the implementation details vary slightly. The table below summarizes the key BYOIP IPv4 requirements across the three major providers.

Securing the Right Address Space

One of the biggest hurdles in meeting BYOIP IPv4 requirements is actually acquiring the address space. Since the free pool of IPv4 addresses is exhausted, you must turn to the transfer market. When purchasing a block for cloud usage, specific criteria must be met to ensure it is accepted by hyperscalers.

1. Clean History: Only buy from sellers who can provide a detailed history of the block’s usage.
2. Regional Alignment: Ensure the block is registered in the same RIR region where you intend to use the cloud services (e.g., use ARIN addresses for AWS US-East). Cross-region transfers are possible but add significant administrative overhead.
3. Portability: Verify that the addresses are “Portable” (PI) space. If you buy Provider Aggregatable (PA) space, you must get a LOA from the previous ISP releasing the space, which can be difficult to obtain.

Navigating the secondary market can be risky without a vetted partner. IP4 Market simplifies this process by offering a trusted marketplace for buying, selling, and leasing IPv4 addresses. We ensure that all blocks are verified and free of encumbrances, helping you meet the strict BYOIP IPv4 requirements of AWS, Azure, and Google Cloud. Our platform facilitates secure transactions with pre-vetted sellers and provides the documentation support necessary for RIR transfers.