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NETWORK ENGINEERING TOOL

IP Subnet (CIDR) Analyzer

There is no room for error in network planning. Enter your IP and CIDR prefix to breakdown all mathematical details of the network layer in seconds.

Network Parameters

Binary Representation

Type Decimal Binary

Usable IP Range

... - ...
0 Hosts Class C
Network Address
...
Broadcast Address
...
Subnet Mask
...
Wildcard Mask
...

What is CIDR and Subnet Mask?

CIDR (Classless Inter-Domain Routing) allows for more flexible allocation of IP addresses, replacing the old Class A, B, C system. For example, a /24 network can host 254 devices, while a /27 network can host only 30.

How to Calculate Usable Hosts?

Formula: **2^(32 - CIDR) - 2**. For a /24: 32-24=8. 2^8 = 256. Subtract Network and Broadcast addresses (2), leaving 254 usable IPs.

What is a Wildcard Mask?

A Wildcard mask is the inverse of a Subnet mask. It is commonly used in Cisco routers for defining Access Control Lists (ACLs). The wildcard for 255.255.255.0 is 0.0.0.255.

Network FAQ

Where are /30, /31, and /32 used?
/30 is typically used for point-to-point (P2P) links between two routers (2 IPs). /31 is used in modern hardware for P2P to save IPs. /32 represents a single IP address (Loopback).
What are Private IP ranges?
10.0.0.0/8 (Class A), 172.16.0.0/12 (Class B), and 192.168.0.0/16 (Class C) are private blocks used in local networks (LANs) and are not routable on the public internet.