What is subnet mask in IP address?

A subnet mask is a 32- or 128-bit number that segments an existing IP address in a TCP/IP network. It is used by the TCP/IP protocol to determine whether a host is on the local subnet or on a remote network. Once given the IP address and its subnet mask, the network address (subnet) of a host can be determined.

What is IP hostname?

In the Internet, a hostname is a domain name assigned to a host computer. This kind of hostname is translated into an IP address via the local hosts file, or the Domain Name System (DNS) resolver.

What is the range of a Class A IP address?

Class A IP addresses range from 1.0.0.0 to 127.255.255.255, with a default mask of 255.0.0.0 (or /8 in CIDR). This means that Class A addressing can have a total of 128 (2 7 ) networks and 16,777,214 (2 24 -2) usable addresses per network.

How many host addresses can be assigned to a subnet?

However, the more subnets available, the less host addresses available per subnet. For example, a Class C network of 204.17.5.0 and a mask of 255.255.255.224 (/27) allows you to have eight subnets, each with 32 host addresses (30 of which could be assigned to devices). If you use a mask of 255.255.255.240 (/28), the breakdown is:

What is the default subnet mask for a Class C IP address?

Class C IP Addresses For Class C IP addresses, the first three octets (24 bits / 3 bytes) represent the network ID and the last octet (8 bits / 1 bytes) is the host ID. Class C IP Addresses range from 192.0.0.0 to 223.255.255.255, with a default subnet mask of 255.255.255.0 (or /24 in CIDR).

What is the use of subnetting in classless addressing?

Classless Addressing To reduce the wastage of IP addresses in a block, we use sub-netting. What we do is that we use host id bits as net id bits of a classful IP address. We give the IP address and define the number of bits for mask along with it (usually followed by a ‘/’ symbol), like, 192.168.1.1/28.