Question 1

How does subnet calculation work?

Accepted Answer

A subnet mask divides an IP address into network and host portions. The calculator uses bitwise operations on the IP and mask to determine the network range, broadcast address, and available host addresses.

Question 2

What is CIDR notation?

Accepted Answer

CIDR (Classless Inter-Domain Routing) notation uses a slash followed by the number of network bits (e.g., /24 means 24 bits for network, 8 for hosts). A /24 equals subnet mask 255.255.255.0.

Question 3

What is a wildcard mask?

Accepted Answer

A wildcard mask is the inverse of a subnet mask. It is used in access control lists (ACLs) on routers. For a /24 network, the wildcard mask is 0.0.0.255.

Question 4

Why are there fewer usable hosts than total addresses?

Accepted Answer

Two addresses are reserved in each subnet: the network address (first) and the broadcast address (last). For a /24 network with 256 total addresses, 254 are usable for hosts.

IPv4 Subnet Calculator

About this tool

Frequently Asked Questions

Related Tools

IP Lookup

Popular Tools