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articles/oracle/oracle-db/oracle-database-plan-ip.md

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ms.author: jacobjaygbay
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# Plan for IP Address Space for Oracle Database@Azure
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# Plan for IP address space for Oracle Database@Azure
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When you set up Oracle Database@Azure, you need to plan your IP address space to ensure that you have enough IP addresses for your virtual machine clusters and networking services.
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Other requirements specific to the Client Subnet and the Backup Subnet are provided in the sections for each subnet type that follow.
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## Client Subnet requirements
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## Client subnet requirements
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The Client Subnet has the following IP address requirements:
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- Four IP addresses are needed for each virtual machine. virtual machine clusters have a minimum of two virtual machines. Therefore, a virtual machine cluster with two virtual machines requires eight IP addresses in the Client Subnet. Each additional virtual machine added to a virtual machine cluster increases the number of IP addresses needed in the Client Subnet by 4 IPs.
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- Four IP addresses are needed for each virtual machine. virtual machine clusters have a minimum of two virtual machines. Therefore, a virtual machine cluster with two virtual machines requires eight IP addresses in the Client Subnet. Each other virtual machine added to a virtual machine cluster increases the number of IP addresses needed in the Client Subnet by 4 IPs.
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- Each virtual machine cluster requires three IP addresses for Single Client Access Names ([SCANs](https://docs.oracle.com/en/cloud/paas/exadata-cloud/csexa/connect-db-using-net-services.html)), regardless of how many virtual machines are present in the virtual machine cluster.
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- 17 IP addresses are reserved for networking services in the Client Subnet, regardless of how many virtual machine clusters are present in the Client Subnet. The 17 addresses are the first 16 IP addresses, and the last IP address.
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**Example**: IP addresses required for a Client Subnet that has one virtual machine cluster with two virtual machines.
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``11 IPs *(virtual machine cluster with 2 virtual machines, plus 3 SCANs)* + 17 IPs *(Networking)* = 28 IPs.``
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### virtual machine cluster scenarios: CIDR size needed for the Client Subnet
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### Virtual machine cluster scenarios: CIDR size needed for the client subnet
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The following table shows scenarios of provisioned virtual machine clusters of differing sizes. The number of each scenario that can fit in a Client Subnet depends on the CIDR size used by the subnet. This table doesn't show all possible scenarios.
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The following table shows scenarios of provisioned virtual machine clusters of varying sizes. The number of each scenario that can fit in a Client Subnet depends on the CIDR size used by the subnet. This table doesn't show all possible scenarios.
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|Scenario|/27|/26|/25|/24|/23|/22|
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|--------|---|---|---|---|---|---|
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|1 virtual machine cluster with 2 virtual machines *(11 IPs + 17 Networking = 28)*|1|4|10|21|45|91|
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|1 virtual machine cluster with 3 virtual machines *(15 IPs + 17 Networking = 32*|1|3|7|15|33|67|
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|1 virtual machine cluster with 4 virtual machines *(19 IPs + 17 Networking = 36)*| |2|5|12|26|53|
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|2 virtual machine clusters with 2 virtual machines each *(22 IPs + 17 Networking = 39)*| |2|5|10|22|45|
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|2 virtual machine clusters with 3 virtual machines each *(30 IPs + 17 Networking = 47)*| |1|3|7|16|33|
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|2 virtual machine clusters with 4 virtual machines each *(38 IPs + 17 Networking = 55)*| |1|2|6|13|26|
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|One virtual machine cluster with two virtual machines *(11 IPs + 17 Networking = 28)*|1|4|10|21|45|91|
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|One virtual machine cluster with three virtual machines *(15 IPs + 17 Networking = 32*|1|3|7|15|33|67|
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|One virtual machine cluster with four virtual machines *(19 IPs + 17 Networking = 36)*| |2|5|12|26|53|
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|Two virtual machine clusters with two virtual machines each *(22 IPs + 17 Networking = 39)*| |2|5|10|22|45|
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|Two virtual machine clusters with three virtual machines each *(30 IPs + 17 Networking = 47)*| |1|3|7|16|33|
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|Two virtual machine clusters with four virtual machines each *(38 IPs + 17 Networking = 55)*| |1|2|6|13|26|
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### virtual machine cluster scenarios: CIDR size needed for the Client Subnet
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### Virtual machine cluster scenarios: CIDR size needed for the client subnet
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The following table shows scenarios of provisioned virtual machine clusters of differing sizes. The number of each scenario that can fit in a Client Subnet depends on the CIDR size used by the subnet. This table doesn't show all possible scenarios.
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The following table shows scenarios of provisioned virtual machine clusters of varying sizes. The number of each scenario that can fit in a Client Subnet depends on the CIDR size used by the subnet. This table doesn't show all possible scenarios.
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|Scenario|/27|/26|/25|/24|/23|/22|
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|--------|---|---|---|---|---|---|
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|1 virtual machine cluster with 2 virtual machines *(11 IPs + 17 Networking = 28)*|1|2|4|9|18|36|
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|1 virtual machine cluster with 3 virtual machines *(15 IPs + 17 Networking = 32)*|1|2|4|8|16|32|
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|1 virtual machine cluster with 4 virtual machines *(19 IPs + 17 Networking = 36)*| |1|3|7|14|28|
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|2 virtual machine clusters with 2 virtual machines each *(22 IPs + 17 Networking = 39)*| |1|3|6|13|26|
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|2 virtual machine clusters with 3 virtual machines each *(30 IPs + 17 Networking = 47)*| |1|2|5|10|21|
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|2 virtual machine clusters with 4 virtual machines each *(38 IPs + 17 Networking = 55)*| |1|2|4|9|18|
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|One virtual machine cluster with two virtual machines *(11 IPs + 17 Networking = 28)*|1|2|4|9|18|36|
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|One virtual machine cluster with three virtual machines *(15 IPs + 17 Networking = 32)*|1|2|4|8|16|32|
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|One virtual machine cluster with four virtual machines *(19 IPs + 17 Networking = 36)*| |1|3|7|14|28|
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|Two virtual machine clusters with two virtual machines each *(22 IPs + 17 Networking = 39)*| |1|3|6|13|26|
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|Two virtual machine clusters with three virtual machines each *(30 IPs + 17 Networking = 47)*| |1|2|5|10|21|
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|Two virtual machine clusters with four virtual machines each *(38 IPs + 17 Networking = 55)*| |1|2|4|9|18|
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## Backup Subnet requirements
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## Backup subnet requirements
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The Backup Subnet has the following IP address requirements:
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- 3 IP addresses for each virtual machine. virtual machine clusters have a minimum of 2 virtual machines. Therefore, a virtual machine cluster with 2 virtual machines requires 6 IP addresses in the backup subnet. Each additional virtual machine added to a virtual machine cluster increases the number of IP addresses needed in the Backup Subnet by 3 IPs.
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- Networking services require 3 IP addresses for the Backup Subnet, regardless of how many virtual machine clusters are present in the Backup Subnet.
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- Three IP addresses for each virtual machine. virtual machine clusters have a minimum of two virtual machines. Therefore, a virtual machine cluster with two virtual machines requires six IP addresses in the backup subnet. Each other virtual machine added to a virtual machine cluster increases the number of IP addresses needed in the Backup Subnet by 3 IPs.
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- Networking services require three IP addresses for the Backup Subnet, regardless of how many virtual machine clusters are present in the Backup Subnet.
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**Example**: IP addresses required for a Backup Subnet that has 1 virtual machine cluster with 2 virtual machines.
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**Example**: IP addresses required for a Backup Subnet that has one virtual machine cluster with two virtual machines.
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``6 IPs *(virtual machine cluster with 2 virtual machines)* + 3 IPs *(Networking)* = 9 IPs.``
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### virtual machine cluster scenarios: CIDR size needed for the Backup Subnet
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### Virtual machine cluster scenarios: CIDR size needed for the Backup Subnet
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The following table shows scenarios of provisioned virtual machine clusters of differing sizes. The number of each scenario that can fit in a Backup Subnet depends on the CIDR size used by the subnet. This table doesn't display all possible scenarios.
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|Scenario|/28|/27|/26|/25|/24|/23|
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|--------|---|---|---|---|---|---|
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|1 virtual machine cluster with 2 virtual machines *(6 IPs + 3 Networking = 9)*|1|3|7|14|28|56|
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|1 virtual machine cluster with 3 virtual machines *(9 IPs + 3 Networking = 12)*|1|2|5|10|21|42|
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|1 virtual machine cluster with 4 virtual machines *(12 IPs + 3 Networking = 15)*|1|2|4|8|17|34|
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|2 virtual machine clusters with 2 virtual machines each *(12 IPs + 3 Networking = 15)*|1|2|4|8|17|34|
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|2 virtual machine clusters with 3 virtual machines each *(18 IPs + 3 Networking = 21)*| |1|3|6|12|24|
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|2 virtual machine clusters with 4 virtual machines each *(24 IPs + 3 Networking = 27)*| |1|2|4|9|18|
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|One virtual machine cluster with two virtual machines *(6 IPs + 3 Networking = 9)*|1|3|7|14|28|56|
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|One virtual machine cluster with three virtual machines *(9 IPs + 3 Networking = 12)*|1|2|5|10|21|42|
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|One virtual machine cluster with four virtual machines *(12 IPs + 3 Networking = 15)*|1|2|4|8|17|34|
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|Two virtual machine clusters with two virtual machines each *(12 IPs + 3 Networking = 15)*|1|2|4|8|17|34|
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|Two virtual machine clusters with three virtual machines each *(18 IPs + 3 Networking = 21)*| |1|3|6|12|24|
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|Two virtual machine clusters with four virtual machines each *(24 IPs + 3 Networking = 27)*| |1|2|4|9|18|
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## Usable IPs for client and Backup subnets by CIDR size
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