IPv4 Range Expander Online

Expand an IPv4 start and end range into valid CIDR blocks and subnet notation for network planning.

Common use cases

• Give a start and end IPv4 address and get the smallest covering subnet.
• Turn an address range into CIDR notation for a firewall rule.
• Find the mask that spans two endpoints of a range.

Related tools

• IPv4 Subnet Calculator Online

  Calculate IPv4 CIDR details including network address, broadcast address, subnet mask, host range, and bitmask.

• IPv4 Address Converter Online

  Convert IPv4 addresses to decimal, binary, hexadecimal, IPv6 notation, and other address representations.

• IPv6 ULA Generator Online

  Generate local IPv6 ULA prefixes and non-routable network addresses according to RFC 4193.

• MAC Address Generator Online

  Generate random MAC addresses online with optional prefixes and uppercase or lowercase formatting.