shell:$ nslookup -timeout=2 -retry=1 'corp.mobile.rakuten.co.jp'
Server:		127.0.0.53
Address:	127.0.0.53#53

Non-authoritative answer:
corp.mobile.rakuten.co.jp	canonical name = any3.mobile.rakuten.co.jp.edgekey.net.
any3.mobile.rakuten.co.jp.edgekey.net	canonical name = e242335.a.akamaiedge.net.
Name:	e242335.a.akamaiedge.net
Address: 23.222.17.75
Name:	e242335.a.akamaiedge.net
Address: 23.222.17.70