![]() ![]() If all the host part bits are binary number "1", that is the directed broadcast address for that network.Ĭonsider below example of two Class B neworks.Configurable IPv4 addresses must contain atleast one non-zero bit in any host part octet.If all host part bits are binary number "0", that is the network address.The purpose of the subnet mask is to identify which part of an IPv4 address is the network part and which part is the host part.īelow image shows the default subnet masks for Class A, Class B and Class C IPv4 networks. To identify which part of an IPv4 address is the network part and which part of the IPv4 address is host part, we need another identifier called as "subnet mask". If you express an IPv4 address as plain as 172.16.0.100, there is no way to identify which is the network part and which is the host part. Network part is used to identify the network that the computer belongs to and the host part is a unique identifier of that computer within the network. We need a mechanism to separate an IPv4 address to a network part and a host part. Example of a subnet mask is 255.255.0.0.Ī 32-bit IPv4 address (example: 172.16.0.100) is further divided into a network part and a host part. Subnet mask is also expressed as four 8-bit (4 * 8 = 32 bits) numbers, separated by a dot. What is subnet mask? Subnet mask is also a 32-bit binary number. IPv4 addresses are expressed as four 8-bit (4 * 8 = 32 bits) numbers, separated by a dot. Various other trademarks are held by their respective owners.As explained in previous lesson about IPv4 addresses, an IPv4 address is a 32-bit binary number used to identify a computer uniquely in an IPv4 based TCP/IP network. ![]() WatchGuard and the WatchGuard logo are registered trademarks or trademarks of WatchGuard Technologies in the United States and other countries. Because you cannot configure a virtual external interface with a default gateway on a different subnet, you cannot use a /32 subnet mask for a virtual external interface, such as a VLAN or Link Aggregation interface. In mixed routing mode, you can only configure a 32-bit subnet mask for a physical external interface. 32-bit Subnet Mask (/32)Ī 32-bit subnet mask defines a network with only one IP address. The use of 31-bit subnet masks for IPv4 point-to-point links is described in RFC 3021. ![]() A 31-bit subnet mask is often used for an interface that is the endpoint of a point-to-point network. In mixed routing mode, you can configure any external interface to use an IPv4 address with a 31-bit subnet mask. For information about slash notation, see About Slash Notation. When you configure an IP address, you specify the subnet mask in slash notation. ![]() 31-bit and 32-bit subnet masks are supported in Fireware v12.1 and higher for secondary external interfaces. If your Firebox is configured in mixed routing mode, you can configure an external interface to use an IPv4 address with a 31-bit or 32-bit subnet mask.ģ1-bit and 32-bit subnet masks are supported in Fireware XTM v11.9.4 and higher for primary external interfaces. To conserve IPv4 addresses, some Internet Service Providers assign IPv4 addresses with a /31 or /32 subnet mask. ![]()
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