Invalid Example Tool for DNS Lookup

[savgrvz]

MDN URL

https://developer.mozilla.org/en-US/docs/Learn_web_development/Getting_started/Web_standards/How_the_web_works

What specific section or headline is this issue about?

DNS Explained

What information was incorrect, unhelpful, or incomplete?

When re-entering the provided IP address, after doing the initial lookup function, it returns with errors for all addresses given. Perhaps the tool may be broken?

What did you expect to see?

I expected to return to the Mozilla page as stated in the section.

Do you have any supporting links, references, or citations?

Do you have anything more you want to share?

No response

MDN metadata

Page report details

• Folder: en-us/learn_web_development/getting_started/web_standards/how_the_web_works
• MDN URL: https://developer.mozilla.org/en-US/docs/Learn_web_development/Getting_started/Web_standards/How_the_web_works
• GitHub URL: https://github.com/mdn/content/blob/main/files/en-us/learn_web_development/getting_started/web_standards/how_the_web_works/index.md
• Last commit: 4d00799
• Document last modified: 2025-10-20T20:36:53.000Z

[chrisdavidmills]

Thanks for reporting this, @savgrvz! This used to work for most websites, but it seems that this is no longer the case, due to how modern web servers/DNS works. I will rewrite this bit not to ask the reader to try typing it in.