Is this IPv6 or older RFC?

General Discussion (off topic) Anything and everyt
#1

I haven’t checked the new RFC but this should work:
http://3238872391

It’s new to me that the browser can recognise this. Any links and explanations to read after how it works? Nslookup can also recognise it as 193.13.69.71, how it comes out from that number?

Thanks in avance,

Arki