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What will happen if a private IP address is assigned to a public interface connected to an ISP?

Lim How Wei
August 21, 2024

There will be no internet access by assigning a private IP address to a public-facing interface connected to an ISP.

It’ll also cause network conflicts, leading to network disruptions and NAT problems.

It also comes with security risks and internal network services might be exposed.

The address will also not be routable on the internet because it won’t be recognized or routed by ISPs.

In this article, you’ll learn the answer to “What will happen if a private IP address is assigned to a public interface connected to an ISP?“.

What will happen if a private IP address is assigned to a public interface connected to an ISP?

Question: What will happen if a private IP address is assigned to a public interface connected to an ISP?

Answer: Addresses in a private range will not be routed on the Internet backbone.

Further reading

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How to Fix “Windows protected your PC” Pop Up

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Lim How Wei

Lim How Wei is the founder of followchain.org, with 10+ years of experience in Social Media Marketing and 5+ years of experience as an active investor in stocks and cryptocurrencies. He has researched, tested, and written thousands of articles ranging from social media platforms to messaging apps.

Lim has been quoted and referenced by major publications and media companies like WikiHow, Fast Company, HuffPost, Vice, New York Post, The Conversation, and many others. One of his articles about the gig economy was quoted by Joe Rogan, who hosts The Joe Rogan Experience (the most popular podcast in the world), in the This Past Weekend podcast (the third most popular podcast in the world as of 2026) by Theo Von.

In his free time, Lim uploads personal finance videos on his YouTube channel, Lim Finance, to guide others on their financial journey. He also creates gaming guides, walkthroughs, solutions, and tips for the games he plays, helping players with their progression.