shell:$ nslookup -timeout=2 -retry=1 'event.line-sec.co.jp'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
event.line-sec.co.jp	canonical name = d18svb6hvieh7e.cloudfront.net.
Name:	d18svb6hvieh7e.cloudfront.net
Address: 3.162.163.79
Name:	d18svb6hvieh7e.cloudfront.net
Address: 3.162.163.41
Name:	d18svb6hvieh7e.cloudfront.net
Address: 3.162.163.30
Name:	d18svb6hvieh7e.cloudfront.net
Address: 3.162.163.55