shell:$ nslookup -timeout=2 -retry=1 'ksef.mf.gov.pl'
Server:		127.0.0.53
Address:	127.0.0.53#53

Non-authoritative answer:
ksef.mf.gov.pl	canonical name = nudnsjz.ng.impervadns.net.
Name:	nudnsjz.ng.impervadns.net
Address: 45.60.74.103