Use this network utility to parse, normalize, convert, or derive IPv4, IPv6, subnet, reverse-DNS, or MAC addressing information under a stated prefix convention.

Address

Any address inside the network.

Prefix

Prefix length in bits.

Compute network address, broadcast, host range, and capacity for an IPv4 CIDR block. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Network

Lowest address in the network.

Broadcast

Highest address in the network.

First host

First assignable host.

Last host

Last assignable host.

Total hosts

Assignable host count.

• Syntax and arithmetic validity do not establish reachability, ownership, routing, DNS, privacy, or authorization. IPv4 special-use ranges, IPv6 scopes and compression, prefix boundaries, mapped forms, and host-count conventions require explicit handling.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Validate against current IANA registries and the target platform, test boundary prefixes, and use live network tools only with appropriate authorization.

• IPv4 Broadcast Address Calculator

  Compute an IPv4 broadcast address from an address and subnet mask.

• IPv4 Usable Host Count Calculator

  Compute assignable IPv4 host addresses from a CIDR prefix, including /31 point-to-point and /32 host routes.

• IPv4 Network Address Calculator

  Compute an IPv4 network address from an address and subnet mask.