If you get a subnet like 192.168.0.0 with a mask 255.255.255.192, without hesitation you must calculate 256 - 192 = 64 hosts per subnets ( subtract 2 for bcast and network) 255.255.255.128 = 256 - 128 = 128 - 2

Your broadcast address will be always be the last address within your subnet, in the first subnet that would be 172.16.7.255 (don't forget that last octet when figuring the broadcast) The range of your first subnet is 172.16.0.0-172.16.7.255 with 172.16.0.0 being the network address and 172.16.7.255 being your broadcast address. Jul 15, 2020 · The subnet mask. The IP subnet mask will give you the Network ID for any given subnet. If you take the IP address of a device within the subnet and apply the subnet mask to it with Boolean algebra, you end up with the Network ID. Remember that the Network ID is also the first address in the range allocated to the subnet. At a simplistic level a wildcard mask can be thought of as an inverted subnet mask. For example, a subnet mask of 255.255.255.0 (binary equivalent = 11111111.11111111.11111111.00000000) inverts to a wildcard mask of 0.0.0.255 (binary equivalent = 00000000.00000000.00000000.11111111). A wild card mask is a matching rule. Nov 12, 2007 · A 255.255.248.0 subnet means that the first 21 bits of the address are reserved to identify the subnet leaving 11 bits for hosts. The calculation for figuring out how many hosts you can have would be 2 (number of possibilities for a bit, 1 or 0) to the 11th power (11 being the number of host bits allowed by the subnet mask) minus 2 (the minus 2 removes the reserved addresses for the subnet and /0 0.0.0.0 /1 128.0.0.0 /2 192.0.0.0 /3 224.0.0.0 /4 240.0.0.0 /5 248.0.0.0 /6 252.0.0.0 /7 254.0.0.0 /8 255.0.0.0 /9 255.128.0.0 /10 255.192.0.0 /11 255.224.0.0 /12 ABOUT SUBNET CALCULATOR. The subnet calculator lets you enter a subnet range (CIDR) and see IP address information about that range You can type your range directly in CIDR notation, or use the optional Mask pull-down: 74.125.227.0/29; 74.125.227.0, then select Optional Mask from dropdown

## Sep 24, 2018 · From the subnet mask of 255.255.248.0 we learn that the increment is 8 therefore 172.16.8.0 is a network address which cannot be assigned to a host. Other network addresses are 172.16.16.0, 172.16.24.0, 172.16.32.0… Notice that 172.16.31.0 is a valid host address (which belongs to 172.16.24.0 to 172.16.31.255 subnet).

The CIDR number comes from the number of 1's in the subnet mask when converted to binary. The common subnet mask 255.255.255.0 is 11111111.11111111.11111111.00000000 in binary. This adds up to 24 1's, or /24 (pronounced 'slash twenty four'). If you get a subnet like 192.168.0.0 with a mask 255.255.255.192, without hesitation you must calculate 256 - 192 = 64 hosts per subnets ( subtract 2 for bcast and network) 255.255.255.128 = 256 - 128 = 128 - 2 Address: 192.168.0.1 11000000.10101000.00000 000.00000001 Netmask: 255.255.248.0 = 21 11111111.11111111.11111 000.00000000 Wildcard: 0.0.7.255 00000000.00000000.00000 IP/mask Up to the last IP in the subnet Mask Address count Class; a.b.c.d/32 +0.0.0.0: 255.255.255.255: 1: 1 / 256 C: a.b.c.d/31 +0.0.0.1: 255.255.255.254: 2: 1/128 C

### Oct 04, 2019 · IPv4 Subnet Calculator - 255.255.255.225/28

Number of Addresses Number of Bits Prefix Classful Notation Mask; 1: 0 /32: 255.255.255.255: 2: 1 /31: 255.255.255.254: 4: 2 /30: 255.255.255.252: 8: 3 /29: 255.255 Oct 17, 2019 · The CIDR number comes from the number of ones in the subnet mask when converted to binary. The common subnet mask 255.255.255.0 is 11111111.11111111.11111111.00000000 in binary. This adds up to 24 ones, or /24 (pronounced ‘slash twenty four’). A subnet mask of 255.255.255.192 is 11111111.11111111.11111111.11000000 in binary, or 26 ones the "natural" Class C mask, you can denote these addresses as having a 3-bit subnet mask. Or, secondly, the mask of 255.255.255.224 can also be denoted as /27 as there are 27 bits that are set in the mask. This second method is used with CIDR. With this method, one of these networks can be described with the notation prefix/length. For example, Subnet mask– 255.255.255.248 (binary) 11111111.11111111.11111111.11111000 (decimal notation) From the decimal notation we can calculate the number of bits having 1 in each octet: 8+8+8+5= 29. Thus the Subnet mask can be denoted as /29. With Network ID it can be denoted as 192.168.1.9/29. IPv6 Subnet Cheat Sheet. IPv6 is a complete and different animal as far as subnetting goes. Please note the yellow rows as each has special common use or notes. If there is nothing in the "Amount of a /64" column that means it is to miniscule or to massive to justify calculation. Not much is the same with IPv6 compared to IPv4. Jul 17, 2005 · The dividing line between the network and host parts is determined by the subnet mask, and it's often seen in 255.255.255.0 notation. It looks like an IP address, and it uses a "1" bit to select, or "mask" the network part.