shell:$ nslookup -timeout=2 -retry=1 'access.1und1.de'
Server:		1.1.1.1
Address:	1.1.1.1#53

Non-authoritative answer:
access.1und1.de	canonical name = access.1und1.de.cdn.cloudflare.net.
Name:	access.1und1.de.cdn.cloudflare.net
Address: 104.18.6.228
Name:	access.1und1.de.cdn.cloudflare.net
Address: 104.18.7.228
Name:	access.1und1.de.cdn.cloudflare.net
Address: 2606:4700::6812:6e4
Name:	access.1und1.de.cdn.cloudflare.net
Address: 2606:4700::6812:7e4