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CIDR to IP Range Converter

Convert CIDR notation (e.g., 192.168.0.0/24) to all IP addresses in that range. This free tool helps network engineers, system administrators, and IT students quickly calculate and visualize IP address ranges with complete network information.

Understanding CIDR Notation and IP Ranges

CIDR (Classless Inter-Domain Routing) is an IP addressing scheme that improves the allocation of IP addresses. Unlike traditional classful networking, CIDR allows for more flexible address allocation by using variable-length subnet masking (VLSM). This enables:

Practical Applications of CIDR Conversion

Network professionals frequently need CIDR conversion for:

Network Design

When planning new network segments, knowing the exact IP range helps allocate addresses properly and avoid conflicts.

Security Configuration

Firewall rules and ACLs often require specific IP ranges that can be derived from CIDR notation.

Troubleshooting

Identifying whether an IP belongs to a particular subnet is essential for diagnosing connectivity issues.

Complete Technical Breakdown

Parameter Description Example (/24)
Network Address The first address in the range representing the network itself 192.168.0.0
Usable Host Range IPs that can be assigned to devices (excludes network/broadcast) 192.168.0.1 - 192.168.0.254
Broadcast Address Special address for sending to all hosts in the network 192.168.0.255
Total Hosts Number of assignable IP addresses (2(32-n)-2) 254

Step-by-Step Conversion Guide

For Network Engineers

  1. Enter your CIDR notation (e.g., 10.0.32.0/22)
  2. Review the network address and broadcast address
  3. Check the subnet mask matches your expectations
  4. Use the IP range for firewall rules or device configuration

For Students

  1. Input example CIDR blocks from your coursework
  2. Verify your manual calculations against our results
  3. Study how prefix length affects the number of hosts
  4. Experiment with different class ranges (A, B, C)

Frequently Asked Questions

What's the difference between CIDR and traditional subnetting?

Traditional subnetting used fixed class boundaries (Class A: /8, Class B: /16, Class C: /24), while CIDR allows any prefix length from /0 to /32. This eliminates the inefficiency of classful networking where small organizations might get a whole Class C (256 addresses) when they only needed 10.

How does IPv6 CIDR notation differ?

IPv6 uses the same CIDR principle but with 128-bit addresses instead of 32-bit. Notation looks like 2001:db8::/32. Our tool currently focuses on IPv4 but may expand to IPv6 in the future.

Professional Tips

  • For public IP ranges, always check WHOIS records to verify ownership
  • When working with large networks (/16 or larger), consider using our subnet calculator for further division
  • Remember that some cloud providers use non-standard CIDR allocations