STARM
STARM Netkit / v0.1 public preview

Give every network
a clear boundary.

Calculate IPv4 ranges, split subnets and check for address-space overlap before you change a container, service or application network.

Local address calculations only. Netkit does not scan networks or test reachability. /31 uses point-to-point host semantics; /32 represents a single host.

Netkit guide

IPv4 network calculator

Browser local
Host addresses are normalized to their network boundary.
Network—
Subnet mask—
Total addresses—
Usable hosts—
First usable
—
Last usable
—
Network address
—
Last address
—
Input address type
—

Network overlap check

IPv4

Compare two address ranges. Useful when planning container bridges, service networks or VPN routes.

Calculating…

Disjoint ranges avoid an address-space conflict. They do not guarantee connectivity; routes, gateways and firewall rules still matter.

Subnet planner

Splits the network from the calculator above into equal subnets. Up to the first 64 rows are shown and included in the JSON export.

Calculated subnet ranges
SubnetFirst usableLast usableUsable hosts
IPv4 planning only in v0.1. Address type describes the input address, rather than every address in a broad network. IPv6, DNS lookups and live connectivity diagnostics are not available in this release.