IP Subnet Calculator
Calculate IP subnets, CIDR notation, VLSM, and network ranges for efficient network planning.
Professional Network Planning Tools
Comprehensive calculators for network engineers, system administrators, and IT professionals
Subnet Calculator
IPv4 subnet calculation
CIDR Calculator
Classless routing notation
VLSM Planning
Variable length subnetting
IP Lookup
Network information finder
Basic Subnet Calculator
Enter IP address and subnet mask or CIDR notation
Enter an IP address and subnet mask to calculate network information
VLSM Calculator
Variable Length Subnet Masking - Plan multiple subnets
Enter a base network and subnet requirements to calculate VLSM allocation
IP Address Lookup
Get detailed information about any IP address
Enter an IP address to get network class, type, and binary representation
Binary Calculator
Convert between decimal and binary IP addresses
Enter IP address and subnet mask to see binary representation and network calculations
CIDR Notation Reference
| CIDR | Subnet Mask | Hosts | CIDR | Subnet Mask | Hosts |
|---|---|---|---|---|---|
| /8 | 255.0.0.0 | 16,777,214 | /20 | 255.255.240.0 | 4,094 |
| /16 | 255.255.0.0 | 65,534 | /24 | 255.255.255.0 | 254 |
| /18 | 255.255.192.0 | 16,382 | /28 | 255.255.255.240 | 14 |
| /19 | 255.255.224.0 | 8,190 | /30 | 255.255.255.252 | 2 |
IP Subnet Calculator Features
- Calculate IPv4 subnets with CIDR notation and subnet masks
- VLSM (Variable Length Subnet Masking) planning for efficient IP allocation
- IP address lookup with network class identification and binary conversion
- Binary representation of IP addresses and subnet masks
- Network range calculation with first/last host addresses
- Support for all standard network classes (A, B, C) and custom subnets