IP Subnet Calculator - Professional IPv4 Network Analysis
Welcome to our comprehensive IP Subnet Calculator! This professional tool helps you analyze IPv4 networks, calculate subnet information, and understand network addressing. Whether you're designing networks, troubleshooting connectivity issues, or studying for networking certifications, our calculator provides detailed analysis with step-by-step explanations.
What is a Subnet?
A subnet is a logical subdivision of an IP network. In an IP address, part represents the network while the remainder represents the host. Subnetting allows you to divide large networks into smaller, more manageable segments, improving security and performance.
Calculate Subnet Information
Enter an IPv4 address and subnet mask to calculate network properties.
Understanding IP Subnetting
What is CIDR?
Classless Inter-Domain Routing (CIDR) eliminates the class model and allows network designers to assign any number of bits to the network prefix. This provides more flexibility in choosing the number of hosts per network.
Subnet Mask
A subnet mask is used to create a subnet by allocating several bits in the 32-bit IP address to represent the network. The remaining bits represent the host address.
Network vs Host
The network part of an IP address is used by routers to exchange data between subnets, while the host part is used to send data to individual hosts within the network.
Private vs Public IPs
Private IP addresses (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16) are used for internal networks, while public IPs are routable on the internet.
Common CIDR Notations
| CIDR | Subnet Mask | Usable Hosts | Use Case |
|---|---|---|---|
| /8 | 255.0.0.0 | 16,777,214 | Class A networks |
| /16 | 255.255.0.0 | 65,534 | Class B networks |
| /24 | 255.255.255.0 | 254 | Home networks, small offices |
| /26 | 255.255.255.192 | 62 | Small offices |
| /30 | 255.255.255.252 | 2 | Point-to-point links |