What is the first octet in the subnet mask?
10
Its first octet is 10, which is between 1 and 126, inclusive. Class B networks use a default subnet mask of 255.255.
What is first octet in IP address?
In a class A address, the first octet is the network portion, so the class A address of, 10.1. 25.1, has a major network address of 10. Octets 2, 3, and 4 (the next 24 bits) are for the hosts. Class A addresses are used for networks that have more than 65,536 hosts (actually, up to 16,581,375 hosts!).
What is an octet in binary?
The binary system uses only two digits, which are 0 and 1. A binary digit is called a bit. With IP addressing, an octet is formed by 8 bits. An IP address consists of 32 bits, or four octets.
Can you use the first subnet after subnetting?
After subnetting we cannot use the first subnet or the last subnet for the same reasons. That’s right – we lose both subnets (first & last) and all their 64 host positions. (Possible 8 subnets – 2 = 6 usable subnets)
Which is the last IP address of a subnet?
For example, if you have a subnet mask of255.255.255.0, the entire fourth octet should be for host with the two exceptions of .0 which is the network (this is not assigned to a host) and .255 being the last addess / broadcast address.
Which is the subnet mask for a Class A network?
Class A networks use a default subnet mask of 255.0.0.0 and have 0-127 as their first octet. The address 10.52.36.11 is a class A address. Its first octet is 10, which is between 1 and 126, inclusive. Class B networks use a default subnet mask of 255.255.0.0 and have 128-191 as their first octet. The address 172.16.52.63 is a class B address.
What happens when a packet arrives on a subnet?
When a packet arrives on the 192.168.123.0 subnet (from the local subnet or a remote network), and it has a destination address of 192.168.123.132, your computer will receive it from the network and process it. Almost all decimal subnet masks convert to binary numbers that are all ones on the left and all zeros on the right.