IPv4 addresses are 32-bits long, allowing for over 4 billion unique addresses. 192.168.0.1 is often used as a default local router address for devices like D-Link routers. A subnet mask is used with an IP address to split it into an extended network address and a host address portion rather than functioning as an address on its own.

1. Addresses in IPv4 are 32-bits long. This allows for a maximum of
4,294,967,296 (232) unique addresses.
192.168.0.1 is commonly used in the
form of a D-Link default IP address for
configuration of local router.

4. A subnet mask neither works as an IP address nor does it exist independently of IP addresses.
Instead, subnet masks accompany an IP address, and the two values work together. Applying
the subnet mask to an IP address splits the address into two parts, an extended network
address and a host address.