shell:$ nslookup -timeout=2 -retry=1 'router.cdn.rcs.net.ar'
Server:		1.1.1.1
Address:	1.1.1.1#53

Non-authoritative answer:
router.cdn.rcs.net.ar	canonical name = delivery.cdn.rcs.net.ar.
Name:	delivery.cdn.rcs.net.ar
Address: 190.122.82.45