Subnet Management

Subnet functions include the management of private IP addresses for resources that are connected to a network and the automatic setting of an IP address with DHCP.

Creating a Subnet

You can set the following items on a network to create a subnet.

Table 1. List of Subnet Settings
Item Description Required
Subnet Name Specify a name to identify the subnet.  
Network ID Specify the ID of the network to which the subnet will belong. Yes
IP Version Specify IPv4. Yes
Network Address

Specify an address from within the following ranges of private IP addresses, in CIDR notation.

  • Class A: -
  • Class B: -
  • Class C: -
Note: Do not specify the ISP shared address (, or any subnet addresses divided off from that subnet)
Note: Do not specify
Tip: IP addresses outside the above ranges can also be used. However, in that case the user is responsible for the settings and verification of the operation.
IP Address Range Specify a starting address and an ending address for the IP address range to be assigned within a network.  
Gateway Address Specify a gateway IP address.  
Enable/Disable DHCP Auto Allocation Specify true or false.  
Availability Zone Name Specify the availability zone where the subnet will be created. If this setting is omitted, the default availability zone will be used.  
Tip: In order to communicate with a DNS server, you must allow outbound communication to the Internet. Check the settings of the security group functions or firewall service, and configure them to allow communication to the DNS server. (Protocol: TCP/UDP, Port No.: 53)

Deleting a Subnet

Delete a subnet that is no longer needed.

Note: If a resource connected to the subnet is currently using an IP address, you will not be able to delete the subnet.