The submask indicates the division between the network id and the host information in an ipV4 address. The default subnet mask indicates the presence of a class A, B, or C based network (the default) without subnetting.
There is no single default subnet mask; it depends on the class network you are using.
Class A 255.0.0.0
Class B 255.255.0.0
Class C 255.255.255.0
The default subnet mask for this address - a class A address - is 255.0.0.0 (same as /8).
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
The network address of an IPv4 address of 192.168.7.5 with a subnet mask of 255.255.255.0 would be 192.168.7.0. Remember that the subnet mask determines the network portion of the IP Address.
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.
255.0.0.0The default subnet mask of a class A network is 255.0.0.0
255.255.255.0
A default subnet mask gives you classful addressing on octet boundaries. A non-default subnet mask implies that you are subnetting a larger network into several smaller ones.
The subnet mask itself is an IP Address so it is also 32 bits
The default subnet mask would be 255.255.0.0 for a class B address.
Since this is a Class C address, the default network mask is 255.255.255.0.Since this is a Class C address, the default network mask is 255.255.255.0.Since this is a Class C address, the default network mask is 255.255.255.0.Since this is a Class C address, the default network mask is 255.255.255.0.
subnet mask default gateway address