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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 CIDR. Subnet Mask. Total IPs. Usable IPs /32: 255.255.255.255: 1: 1 /31: 255.255.255.254: 2: 2* /30: 255.255.255.252: 4: 2 /29: 255.255.255.248: 8: 6 /28: 255.255.255 Sep 03, 2017 · You get this error when trying to assign an invalid IP address. For example you try to assign a host IP address 192.168.0.3 255.255.255.252. As you can see the IP Jun 18, 2008 · Recall that shrinking a /30 subnet to a /31 effectively doubles the number of point-to-point links you can address from a finite range. Cisco IOS has supported /31 subnets for point-to-point links since release 12.2(2)T . Use the information in this appendix to ensure that the outside addresses you choose are in the subnet for the appropriate subnet mask. For example, if your ISP assigns you 204.31.17.176 with a subnet mask of .240, you can see in , Subnet Number 12 for the .240 mask, that hosts can have IP addresses of 204.31.17.177 through 204.31.17.190.

This appendix includes the following sections: • Uses for Subnet Information • Addresses in the .128 Mask • Addresses in the .192 Mask • Addresses in the .224 Mask • Addresses in the .240 Mask • Addresses in the .248 Mask • Addresses in the .252 Mask The subnet masks are also identified by the number of bits in the mask. lists subnet masks by the number of bits in the network ID.

A Full IP subnet cheat sheet in a table format for your day to day subnetting tasks. IPv4 chart includes cidr, subnet mask, wildcard and IPv6 chart includes number of /48, /56, /64, /127 per prefix IP Subnet Masks. The first address of a subnet block (all 0s) is called the network address or network ID. Below is a mask table that makes it easy to look up the

/28 -- 16 Subnets -- 14 Hosts/Subnet. Network # IP Range Broadcast.0.1-.14.15.16.17-.30.31.32.33-.46.47.48.49-.62.63.64.65-.78.79.80.81-.94.95.96.97-.110

IP Calculator / IP Subnetting