Calculate IPv4/IPv6 CIDR subnets, broadcast addresses, usable host ranges, and binary netmasks in local memory.
1Understanding CIDR Subnetting (RFC 4632)
Classless Inter-Domain Routing (CIDR) allocates IP addresses and routes internet traffic efficiently. A CIDR notation like 192.168.1.0/24 specifies both the IP network prefix and the number of fixed routing bits.
2Subnet Calculations Explained
The calculator determines the network subnet address (bitwise AND of IP and mask), broadcast address (bitwise OR with inverted wildcard mask), first usable host, last usable host, total host capacity ($2^{32-\text{CIDR}}$), and binary representations.
3Private vs Public Address Space (RFC 1918)
Automatically classifies IP ranges into Class A, B, C, Multicast, or Experimental, and identifies RFC 1918 private networking blocks (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16).