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You can also try my tool online which obfuscate an ip address. https://wannabe1337.xyz/text-ipobfuscator

Is there a legitimate reason why to obfuscate an ip address?

To get around something that is otherwise blocking it? Seems useful as part of, for example, pentesting.

On the wire it looks identical. It would have to be a very niche use, like a web form that filters periods.

I'd suggest - SPAM.

For example, I use the presence of IPs in the URL as a SPAM signal. If one used such an obfuscated URL, they could avoid some of the SPAM filters.

You may want to be aware that your banner ad was advertising layer 4/7 most powerful services.

I'm guessing advertising ddos / stressor services.

They know. The link goes to:

hxxps://cybervm[.]io/?wannabe1337.xyz