A subnet mask typically appears in the same format as an IP address, consisting of four octets separated by periods (e.g., 255.255.255.0). It identifies the network and host portions of an IP address, with the network part represented by consecutive ones (1s) in binary and the host part by zeros (0s). For example, in the subnet mask 255.255.255.0, the first three octets (255) indicate the network portion, while the last octet (0) indicates the host portion. Subnet masks can also be represented in CIDR notation, such as /24, which signifies that the first 24 bits are used for the network.
Look at the first octet value and check the corresponding range. 1-126 class A, subnet mask 255.0.0.0 128-191 class B, subnet mask 255.255.0.0 192-223 class C, subnet mask 255.255.255.0
It does not require a subnet mask.
If this is a default subnet mask, then it would be a class C subnet mask. If you are subnetting a network and this is not the default subnet mask, then it could be either a class A or class B.
The default subnet mask has a standard size. The custom subnet mask allows you to make subnets that are smaller or larger than the default.
255.255.255.0
2 given subnets
255.255.255.0
The correct subnet mask for the IP address 119.18.45.0 depends on the specific subnetting requirements. However, a common default subnet mask for a Class A address (since 119 is between 1 and 126) is 255.0.0.0. If subnetting is applied, a more specific mask like 255.255.255.0 (for a /24 subnet) could also be used, which allows for 256 addresses within that subnet.
The default subnet mask would be 255.255.0.0 for a class B address.
if the ip address is 192.168.2.1 then the subnet mask should be 255.255.255.0
Subnet mask for the above is 255.0.0.0
The subnet mask for the IP address 10.0.0.138 typically depends on the network configuration. In a default Class A configuration, the subnet mask would be 255.0.0.0, which corresponds to a /8 prefix. However, the actual subnet mask can vary based on specific network needs and can be configured to something like 255.255.255.0 (a /24 prefix) or others depending on how the network is structured.