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If you use a mail server, WWW server or other such server with your own domain name at your location, you will be required to provide a DNS.
The IP address for your network is allocated from KDDI's CIDR (classless inter-domain routing) block in accordance with JPNIC guidelines.
The allocated IP address must be returned to KDDI upon cancellation of the service. KDDI provides one IP address per subscription to your router's WAN port (for connecting with KDDI).