IP Address Range Lookup - Calculate IP Ranges
Enter a CIDR block or IP range to calculate all addresses in the range. Get network address, broadcast address, usable hosts, and subnet details.
Understanding This Tool
What It Does
Find which organization owns a range of consecutive IP addresses and view all the networks and subnets they control. This tool aggregates IP ranges for easier understanding of large network allocations.
Understanding the Results
- Range Start/End: First and last IP address in the range
- Organization: Entity that owns or operates this IP range
- Total Addresses: Count of all IPs in the range
- Subnets: Individual networks within the larger range
- Registration Date: When the range was first allocated
- Region: Geographic region for which the range is allocated
Common Use Cases
- Network Ownership: Identify which company controls a set of IPs
- Peering Analysis: Map network infrastructure and interconnections
- IP Leasing: Verify provider allocations when leasing IP space
- DDoS Mitigation: Block entire ranges from problematic sources
- Compliance Audits: Document all IP resources assigned to your organization
Pro Tips & Best Practices
- CIDR Ranges: Ranges are typically expressed in CIDR notation for efficiency
- Fragmented Ranges: Organizations may own non-contiguous ranges in different regions
- Routing Optimization: Understand range ownership to optimize BGP routing
Last reviewed:
How this tool works: This tool runs in your browser and on our server in real time. Depending on the tool, results are computed directly from the input you provide or retrieved from live, authoritative data sources at the moment you run a lookup. We do not sell your data, and your lookups are kept private — any history shown here is stored only on your device.