Network and IP / banip.win
Understand the address range before deciding on network rules.
IPv4 CIDR subnet calculator, calculates network address, subnet mask and address range, and includes a check method to prevent false blocking.
No registration requiredInput processed locally in the browserIPv4 CIDR Calculator
One IP address or a whole range? Understand CIDR first
Use 192.168.1.42/24 to perform a network range calculation, distinguishing between mathematical address ranges, ordinary subnets, and /31 point-to-point links.