How to Ensure You Buy Clean IPv4 Blocks

As the demand for IPv4 addresses continues to rise, many businesses choose to buy IPv4 blocks to expand their online presence. However, not all IPv4 addresses are “clean.” Some may carry a history of abuse, blacklisting, or legal issues, which can harm your business. Here’s how to make sure the IPv4 blocks you buy are clean and safe to use.

1. Work with Trusted Brokers

Always purchase IPv4 addresses through verified and reputable brokers. Established brokers follow compliance guidelines and reduce the risk of receiving problematic IPs.

2. Check IP Reputation

Before buying, check the reputation of the IPv4 block. Use IP reputation tools to ensure the addresses are not blacklisted for spam, fraud, or malicious activities.

3. Verify Ownership and Documentation

Confirm that the seller has legal ownership of the IPv4 block. Request transfer documentation and ensure the Regional Internet Registry (RIR) records are accurate.

4. Conduct a WHOIS Lookup

A WHOIS lookup will help you verify the current owner and usage history of the IP block. This step can reveal any irregularities or suspicious past activities.

5. Review Blacklist Databases

Check the IPs against global blacklist databases. If the IP block is listed, it may cause email deliverability issues or block access to certain services.

6. Ensure Proper Transfer Process

The transfer should be handled in accordance with RIR policies (such as ARIN, RIPE, or APNIC). This ensures legitimacy and long-term ownership security.

7. Get a Written Agreement

Have a clear written agreement that outlines the terms of the purchase, guarantees clean IPs, and specifies liability if issues are discovered later.

Conclusion

Buying IPv4 blocks is a valuable investment, but due diligence is crucial. By verifying ownership, checking reputation, and working with trusted brokers, you can ensure that the IPv4 addresses you purchase are clean, secure, and ready for use.