nslookup for some sites doesn't work

Guys, I just started to learn networks (I'm 8 yo btw) and in this video [ https://youtu.be/i5-o7mlfjBM ] I'm suggesting the 'nslookup' terminal command to see how translation from web site name into IP address works. It is working fine for many cases but for some it doesn't.

Here are the examples that don't work:

> ~ $ nslookup snn.com

Server:                2600:4040:400f:3700::1

Address:        2600:4040:400f:3700::1#53

Non-authoritative answer:

Name:        snn.com

Address: 192.254.190.68

when I paste 192.254.190.68 into web browser I see:

Sorry, this page doesn't exist.

Please check the URL or go back a page.

404 Error. Page Not Found.

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another example:

nslookup sonos.com

Server:                2600:4040:400f:3700::1

Address:        2600:4040:400f:3700::1#53

Non-authoritative answer:

Name:        sonos.com

Address: 23.203.23.170

returns:

Invalid URL

The requested URL "[no URL]", is invalid.

Reference #9.5395fea5.1552736383.1ca25ed

​

It doesn't work for youtube.com either.

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Can you explain what is wrong, please?