Random IP Address Generator - Free Online Tool
Random IP Address Generator
Generate a Random IP, Optionally Within a CIDR Range
Understanding Random IP Generation
Test Data
Generate realistic sample IP addresses for populating test databases, mock API responses, or demo dashboards.
Range-Constrained Testing
Constrain generation to a specific CIDR block to test subnet-aware logic with values guaranteed to fall inside it.
Teaching Examples
Quickly produce example addresses for networking tutorials or documentation without picking them by hand.
Client-Side Only
All generation happens locally in your browser — no data is ever sent to a server.
Unconstrained vs. CIDR-Constrained Generation
Without a CIDR range, this tool picks a plausible general-purpose address (avoiding the reserved 0.x.x.x and 224+ multicast/reserved ranges for realism). With a CIDR range specified, it computes that block's exact address space and picks uniformly at random from every address within it — including the network and broadcast addresses, since those are still valid addresses within the block even if not always "usable" for host assignment.
Key Takeaways
- Optional CIDR Constraint: Leave blank for any plausible IP, or specify a CIDR block to constrain the range.
- Uniform Distribution: Every address within a specified CIDR block has an equal chance of being generated.
- Client-Side Only: All generation happens locally in your browser — no data is ever sent to a server.