Performing a basic port scan (nmap -F kodansha.co.jp)
Nmap scan report for kodansha.co.jp (13.231.99.251)
Host is up (0.11s latency).
rDNS record for 13.231.99.251: ec2-13-231-99-251.ap-northeast-1.compute.amazonaws.com
Not shown: 98 filtered tcp ports (no-response)
PORT STATE SERVICE
80/tcp open http
443/tcp open https
Nmap done: 1 IP address (1 host up) scanned in 4.41 seconds