Calculate IPv4 and IPv6 subnet metrics instantly: determine network addresses, broadcast addresses, subnet masks, wildcard masks, usable host ranges, and total address capacity with zero network requests and complete client-side privacy.
| Subnetting Standards | RFC 4632 (CIDR), RFC 1918 (Private IPv4), RFC 3021 (/31 Point-to-Point), RFC 4291 (IPv6) |
|---|---|
| Supported Protocols | IPv4 (32-bit dotted decimal) and IPv6 (128-bit hexadecimal) |
| Maximum Input | 10 KB |
| Execution Deadline | 2 s |
Input
192.168.1.10/24Example output
IP Address: 192.168.1.10
CIDR Block: 192.168.1.0/24
Subnet Mask: 255.255.255.0
Wildcard Mask: 0.0.0.255
Network Address: 192.168.1.0
Broadcast Address: 192.168.1.255
Usable Host Range: 192.168.1.1 - 192.168.1.254
Total Addresses: 256
Usable Hosts: 254
IP Class: Class C (/24 default)
Scope: Private (RFC 1918 - Class C)Under traditional subnetting, /31 subnets have 0 usable hosts because network and broadcast take both IPs. With RFC 3021 enabled (default), both addresses are treated as usable endpoints for point-to-point router links.
A /32 prefix denotes an individual host or loopback route where the network address, broadcast address, and host address are all identical, yielding exactly 1 usable host.
IPv6 subnets handle 128-bit addresses calculated with BigInt precision, accurately formatting massive host counts without JavaScript 64-bit float precision loss.
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CIDR stands for Classless Inter-Domain Routing. It replaces legacy class-based IP assignment (Class A, B, C) with flexible prefix lengths indicated by a trailing slash (e.g., /24).
In standard IPv4 subnets (/30 and larger), the first address is reserved as the network identifier and the final address is reserved as the all-hosts broadcast address.
No. All calculations are pure local mathematical bitwise operations performed in your browser. No packets, DNS lookups, or network calls are ever generated.