Professional IPv4 Network & CIDR Intelligence Tool
Input Parameters
/
Common Subnets Cheat Sheet
/24 → .0
/25 → .128
/30 → .252
Network Details
Network Address
--
Broadcast Address
--
Usable IP Range
--
Total Hosts
--
Usable Hosts
--
Wildcard Mask
--
Developer Reference
JavaScript
function getNetwork(ip, bits) {
const mask = (~0 << (32 - bits));
return ip & mask;
}
Python
import ipaddress
net = ipaddress.IPv4Network(
'192.168.1.0/24'
)
Bash
# Install ipcalc
ipcalc 192.168.1.0/24
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IPv4 Subnet Calculator – CIDR, Netmask, and Host Range Tool
Subnetting is the practice of dividing a network into two or more smaller networks. This calculator allows network administrators to quickly determine the boundaries of an IPv4 network. By providing an IP address and a subnet mask (either in CIDR notation like /24 or dotted decimal like 255.255.255.0), the tool generates essential data including the network ID, broadcast address, and the usable host range.
Why Use Subnetting?
Subnetting improves network performance and security. It limits broadcast traffic to smaller segments and allows for better organization of host resources. It is also critical for address conservation in public IP spaces.
FAQs
What is a Wildcard Mask?
A wildcard mask is the inverse of a subnet mask, often used in Cisco Access Control Lists (ACLs) and routing protocols like OSPF. It is calculated by subtracting the subnet mask from 255.255.255.255.
What is /31 Subnetting?
Defined in RFC 3021, /31 subnets are used for point-to-point links. Unlike traditional subnets, they don't have separate network and broadcast addresses, allowing both IPs to be usable.