Admin Table of Contents
What is a valid subnet mask?
Structure of Subnet Masks A subnet mask, like an IP address, is made up of four numbers. 0.0 is a valid subnet mask as opposed to 255.0. 255.0. The 255.255. 0.0 subnet mask identifies the network identifier as the first two digits of the IP address.
What is the subnet mask for 0?
255.255
Subnet Cheat Sheet – 24 Subnet Mask, 30, 26, 27, 29, and other IP Address CIDR Network References
| CIDR | Subnet mask | Wildcard mask |
|---|---|---|
| /3 | 224.0.0.0 | 31.255.255.255 |
| /2 | 192.0.0.0 | 63.255.255.255 |
| /1 | 128.0.0.0 | 127.255.255.255 |
| /0 | 0.0.0.0 | 255.255.255.255 |
What is the 255.255 0.0 mask?
It is a 32-bit number that distinguishes each octet in the IP address. For example, as depicted in Table 4.9, 255.255. 0.0 is a standard Class B subnet mask, since the first two bytes are all ones (network) and the last two bytes are all zeros (host).
How do you know if a subnet mask is valid?
Subnets, hosts and broadcast addresses per subnet: To find the valid subnets for this specific subnet mask you have to subtract 248 from the value 256 (256-248=8), which is the first available subnet address.
How do I know if a subnet is valid?
The normal understanding of a ‘valid’ subnet address is one in which the address quoted is the lowest possible in the specified range. Hence a /26 (64 addresses) would end with a multiple of 64, and a /27 would end with a multiple of 32.
Is 0 a valid subnet?
Some people may even try to argue that it is an invalid IP address because there is a 0 in third octet. However, today, this IP address is perfectly legal when it comes to subnetting.
What does IP address 0.0 0.0 mean?
In IPv4-based routing, 0.0. 0.0 serves as a default route. This means no particular address has been designated in the routing table as the next hop in the packet’s path to its final destination. When the default route is used with a subnet mask of 0.0. 0.0, it matches any address.
Which octet of the subnet mask 255.255 255.0 will tell?
Class C networks use a default subnet mask of 255.255. 255.0 and have 192-223 as their first octet.
What is the subnet mask for 24?
255.255.255.0
Subnet Mask Cheat Sheet
| Addresses | Netmask | |
|---|---|---|
| / 24 | 256 | 255.255.255.0 |
| / 23 | 512 | 255.255.254.0 |
| / 22 | 1024 | 255.255.252.0 |
| / 21 | 2048 | 255.255.248.0 |
How do you know if a subnet is valid?
To calculate the number of possible subnets, use the formula 2n, where n equals the number of host bits borrowed. For example, if three host bits are borrowed, then n=3. 23 = 8, so eight subnets are possible if three host bits are borrowed.
How do you calculate the subnet mask?
How to calculate hosts or subnets based on the subnet mask. A quicker way to figure out how many hosts will exist on a particular subnet is to use the formula 2n-2, where n is the number of bits available to the host ID, where 2n represents 2 raised to the nth power.
What are the functions of subnet mask?
IP subnetting is the practice of dividing a network into two or smaller networks.
How do you find the subnet mask of an IP address?
Type “ipconfig” at the prompt and press “Enter.” This command displays all network interfaces and their configurations, including IP addresses, subnet masks and default gateway. IPv4 (version 4) addresses are formatted in a “dotted-decimal octet” format like “192.168.0.3.”.
What is an example of a subnet mask?
A common example of a subnet mask for class C IP addresses is 255.255.255.0, the default subnet mask for many computers and network routers. When applied to subnet, a subnet mask shows the routing prefix.