Creating a virtual network (VNet) with multiple subnets in Azure is essential for organizing and securing your cloud resources. This blog will walk you through creating a VNet with four subnets using the address space 192.148.30.0/26.
Step 1: Understanding the Address Space
The CIDR notation 192.148.30.0/26 means:
Network address: 192.148.30.0
Subnet mask: 255.255.255.192
Total number of IP addresses: 64 (2^6)
We need to divide this address space into four subnets. Each subnet will have a /28 prefix, giving us 16 IP addresses per subnet (2^4).
Step 2: Calculating the Subnets
Here's how we can divide the 192.148.30.0/26 address space into four /28 subnets:
Subnet 1: 192.148.30.0/28
Network address: 192.148.30.0
Broadcast address: 192.148.30.15
Usable IP range: 192.148.30.1 to 192.148.30.14
Subnet 2: 192.148.30.16/28
Network address: 192.148.30.16
Broadcast address: 192.148.30.31
Usable IP range: 192.148.30.17 to 192.148.30.30
Subnet 3: 192.148.30.32/28
Network address: 192.148.30.32
Broadcast address: 192.148.30.47
Usable IP range: 192.148.30.33 to 192.148.30.46
Subnet 4: 192.148.30.48/28
Network address: 192.148.30.48
Broadcast address: 192.148.30.63
Usable IP range: 192.148.30.49 to 192.148.30.62
1. Create the Virtual Network
Log in to the Azure Portal
Open your web browser and go to the Azure Portal.
Create a New Resource Group
Navigate to Resource groups.
Click on Create and fill in the required details:
Resource group name: Give your resource group a name
Region: Select your preferred region
Click Review + create and then Create.
Create the Virtual Network
Navigate to the Virtual network page
Click on virtual network
Click on create
Fill in the required details:
Name: Name of choice
Subscription: Select your subscription
Resource group: MyResourceGroup
Region: Select the same region as your resource group
Click on next until IP addresses"
2. Configure IP address and Subnets##
Enter the IPV4 address for the virtual network which is 192.148.30.0/26, and from this network, there are going to be 64 addresses. Click on Add a Subnet
The subnet address range will be
Subnet-1 :192.148.30.0/28 - 192.148.30.15/28.
Subnet-2 :192.148.30.16/28 - 192.148.30.31/28.
Subnet-3 :192.148.30.32/28 - 192.148.30.47/28.
Subnet-4 :192.148.30.48/28 - 192.148.30.63/28.
Click on review + create
Click on Create
When Your deployment is complete, click on Go to resource
To have a view of the subnets created, click on Settings on the left pane and then on Subnets
Creating a virtual network (VNet) with multiple subnets is crucial for organizing and securing your Azure resources. Following the steps above, you can set up a VNet with subnets using an address space. VNets help improve organization, enhance security, boost performance, simplify management, and enable seamless connectivity between your on-premises and cloud resources. This setup will make everything neat, secure, and easy to manage, ensuring your cloud infrastructure runs smoothly and efficiently with Azure VNets!
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