Check this for details: https://jvns.ca/blog/2021/11/04/how-do-you-tell-if-a-problem-is-caused-by-dns

As a summary, try to get the website dns through:

dig iloveclim.eu

which, if functionnal will respond something like

iloveclim.eu.		3600	IN	A	78.196.23.159

Trying a non-existing sub-domain:

dig toto.iloveclim.eu

We obtain:

toto.iloveclim.eu.		IN	A