CIDR Notation:IP address is written with a number of bits (CIDR number), with a forward-slash (/) in between.Class D is for multicasting and Class E is for future use. IP Class:IP addresses are categorized into five classes, ranging from Class A to E. Binary Subnet Mask:Subnet mask in binary format.Wildcard Mask:Wildcard masks refers to the inverted bits of the subnet mask to be used with routing protocols (OSPF) and access control lists (ACLs).The total number of addresses without the first address (the network address) and the last address (the broadcast address). Number of Usable Hosts:The addresses that can be assigned to hosts.The range starts with the address right after the network address and ends at one address before the broadcast address. Usable Host IP Range:It refers to the range of IP addresses that can be assigned to hosts.Total Number of Hosts:Total number of addresses available on the network.It is used to send data (broadcast) to every host on that subnet. Broadcast Address:The last address on the subnet.Network Address:The first part of the subnet mask and is the same with the first part of the IP address.IPv4 Subnet Calculator tool will use that information to calculate and display comprehensive information about: Each octet ranges between 0 and 255 and is separated by dots (.) IPv4 has 4 groups of numbers – called octets.
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