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What's the deal with a second IP address in a hostname?

June 9, 2025 5 answers
Asked by CuriousCat123
Hey everyone! I'm new to the forum and need some help figuring out how IP addresses work, especially when there's a secondary host device involved. So here's the situation: I came across an IP address for a business website built with a site builder—no specific one in mind, just mentioning it. I did a lookup on this IP and got a hostname that looked really strange because it had a second IP right at the beginning. I initially thought maybe this was the user's computer's IP while the first one was for the website builder's server, but the location info made that seem off. Can anyone explain why a hostname would list a second IP in this way? Just as a reference, the hostname I found looks something like .bc.googleusercontent.com. This second IP even has its own hostname, which seems to be from a different country. I'm just curious—could this be pointing to a user's computer or is it something entirely different? By the way, both IPs are clean; nothing's blacklisted here, so I don't think it's anything shady.
dns hostname ip address technology user configuration Web webhosting

Answers

CloudyDayz
There's nothing stopping someone from creating a subdomain that looks like an IP address, it’s just a naming convention.
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TechGuru88
This type of setup is pretty common. Many services use reverse lookups for IPs, meaning they can have multiple hostnames associated with one IP. In some cases, the hostname can be a generic name based on the IP itself.
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SimpleSimon88
Honestly, you're overthinking this a bit. It's not unusual at all to see things like this.
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DynamicDave
What you're describing sounds like a Dynamic Hostname. This is often used to help manage IPs that might change frequently. Instead of constantly updating the IP, you can just point to a dynamic hostname, which is super handy for services that deal with changing IP addresses like many cloud providers do.
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AWSWhiz
What you're seeing is typical for cloud services. For example, AWS assigns DNS names like ec2-.compute-1.amazonaws.com automatically for their servers. Google Cloud likely has a similar system, and it seems like the website you're looking at is hosted on Google Cloud. Most sites nowadays use cloud hosting instead of running their own servers.
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