Visual Subnet Calculator (Azure Edition)

Enter the Azure Virtual Network (VNet) Address you wish to subnet: Network Address Mask bits / Show columns: Subnet name Subnet address Netmask Range of addresses Azure Subnet Useable IPs Azure Usable Hosts Divide Join Click below to split and join subnets. If you wish to save this subnetting for later, copy the bookmark this hyperlink. Subnet name Subnet address Netmask Range of addresses Azure Subnet Useable IPs Azure Usable Hosts Divide Join Tips for Azure Virtual Network Azure Reserved Subnet Name Reserved Subnet Name min. Size of Subnet Max. Size of Subnet Recommand Size of Subnet Related Azure Services GatewaySubnet /29 /27 /27 Azure Virtual Network Gateway / ExpressRoute / Site-to-Site VPN RouteServerSubnet /27 /24 /27 Azure Route Server AzureBastionSubnet /26 /24 /26 Azure Bastion AzureFirewallSubnet /26 /26 /26 Azure Firewall AzureFirewallManagementSubnet /26 /16 /26 Azure Firewall Manager Rule Based on Are there any restrictions on using IP addresses within these subnets?, Azure Subnet reserves 5 IP addresses in each subnet for internal use: the first 4 (Network ID, Default Gateway IP, Azure DNS reserved-1, Azure DNS reserved-2) and the last 1 (Network broadcast address) IP addresses. Based on Azure VMet - How small and how large can VNets and subnets be?, The smallest supported IPv4 subnet is /29, and the largest is /2 (using CIDR subnet definitions). IPv6 subnets must be exactly /64 in size. Spotlight Special Thanks to davidc + ChatGPT The source code for Azure Edition page has been forked and ported from davidc/subnets. If you're searching for the original Visual Subnet Calculator, I encourage you to check out Visual Subnet Calculator. Furthermore, as I am not a front-end engineer, the project utilized ChatGPT for suggestions on modifications to HTML / CSS / Javascript.