The subnet mask defines how large each subnet is. You can do this in binary but I’ll use decimal since it’s faster. A quick method is to take the number 256 minus the subnet mask. We are looking at the 4th octet so that’s 248: 256 - 248 = 8. We now know that each subnet has 8 addresses. Let’s start counting from 0 to

Aug 10, 2005 · Class C Subnet Effective Effective Number of Subnet Bits Mask Subnets Hosts Mask Bits ----- ----- ----- ----- ----- 1 2 126 /25 2 4 62 /26 3 8 30 /27 4 16 14 /28 5 32 6 /29 6 64 2 /30 7 128 2* /31 This free online IPv4 subnet calculator also can be used as a teaching tool and presents the subnetting results as easy-to-understand binary values. We can see two things: all host bits are zeroes in a network address, in a broadcast address they are all set. First bits determine the class of your network from A to E. A, B and C are commonly used. A subnet mask is a bitmask that encodes the prefix length associated with an IPv4 address or network in quad-dotted notation: 32 bits, starting with a number of 1 bits equal to the prefix length, ending with 0 bits, and encoded in four-part dotted-decimal format: A subnet mask encodes the same information as a prefix length but A subnetwork or subnet is a logical subdivision of an IP network.: 1,16 The practice of dividing a network into two or more networks is called subnetting. Computers that belong to a subnet are addressed with an identical most-significant bit-group in their IP addresses.

Jan 15, 2020 · This is where subnet masks (also called network masks) come in. A subnet mask is the representation of the network portion of an address. It is also made up of 32 bits with all the bits that represent the network portion being marked as 1s and the other parts marked as 0s. For example, the subnet masks of the IP address classes are: Class A

In a valid subnet mask network part is represented with "1" from left side followed and ended by host part "0" - 11111111.11111111.11111111.00000000 (binary form), (dotted-decimal form) or simply "/24" (where 24 represents that subnet network part is 24 bits long). Subnet calculator allows calculation for Host Bits Address: 11111111.11111111.11111111.11111 000 Netmask: = 29 11111111.11111111.11111111.11111 000 Wildcard: 00000000.00000000

Number of Addresses Number of Bits Prefix Classful Notation Mask; 1: 0 /32: 2: 1 /31: 4: 2 /30: 8: 3 /29: 255.255

So the subnet mask will be If we use the last octet 248. 256-248 = 8, this means the last octet 0-255 is broken up into 32 groups of 8. If you get a subnet like with a mask, without hesitation you must calculate 256 - 192 = 64 hosts per subnets ( subtract 2 for bcast and network) = 256 - 128 = 128 - 2 May 29, 2018 · So, to make sense of this, let’s use some examples: an IP address with a Subnet Prefix such as “” indicates that you are using the IP addressing scheme of 192.168.1.x with the subnet mask of and you have the 254 usable addresses (1-255).