IP Range Generator
Calculate subnet architecture, discover netmasks, define CIDR network boundaries, and compile ready-to-use lists of IP ranges entirely in your browser.
192.168.1.0
192.168.1.255
255.255.255.0
192.168.1.1
192.168.1.254
Professional IP Range & Subnet Compiler
Managing server fleets, firewall access lists, or local routing environments requires precise subnet modeling. Subnets are defined using Classless Inter-Domain Routing (CIDR) block suffixes or explicit start-end IP limits.
Calculating broadcast IPs, netmasks, and total hosts manually can be error-prone, especially when dealing with complex subnet boundaries like /21 or /29 blocks. Developers need a tool that handles calculations and lists IPs instantly.
The SHRTX IP Range Generator provides instant subnet metric evaluations. Choose between CIDR notation and start-end ranges, preview host statistics, and generate fully formatted, downloadable plaintext address lists.
Core Tool Capabilities
- CIDR Boundary Modeling: Input any base IPv4 address with a slash suffix (0 to 32) to compute full network block attributes.
- Start-End IP Extraction: Define a raw custom network span by declaring starting and ending addresses directly.
- Subnet Statistics: Display Netmask, Network ID, Broadcast IP, CIDR Category Class, and usable hosts counts.
- Interactive List Downloads: Export the fully computed list of IP addresses to your clipboard or download it as a raw `.txt` file.
Local Browser Privacy
Your files are processed locally on your device. Files are not uploaded, transmitted, or stored on remote servers.
Once the page has loaded, you can disconnect your network connection and continue using this tool offline.
Target Use Cases
- • Firewall & Security Configuration
- • DHCP IP Pool Planning
- • Network Architecture Auditing
Technical Specifications & Platform Limits
Supports Classless Inter-Domain Routing (CIDR) mapping and standard subnet mask math
Prevents browser freezes on extremely large subnets with a configurable display cap
Instantly maps host blocks in-memory locally inside your browser environment
Step-by-Step Workflow
Select Input Mode
Choose between 'CIDR Block Notation' (e.g. 192.168.1.0/24) and 'Start-End IP Range' settings.
Input Parameters
Type your base address or declare boundaries (like 10.0.0.1 to 10.0.0.150) in the form fields.
Review Subnet Stats
Check the calculated Network ID, Broadcast, Subnet Mask, and Class attributes in the preview panel.
Toggle Display Caps
Configure how many IPs are rendered on screen (up to 10,000) using the list limit dropdown.
Download Plaintext
Copy all generated IP addresses to your clipboard or export the sequence as a plaintext list file.
Practical Real-World Use Cases
Firewall & Security Configuration
Developers generate clean whitelists of individual IP addresses within a CIDR block to paste into firewall policies.
DHCP IP Pool Planning
Developers plan static and dynamic DHCP host scopes by calculating start and end points in network ranges.
Network Architecture Auditing
Developers quickly break down and verify client networks, subnet sizes, and broadcast ranges when auditing VPCs.
Frequently Asked Questions
- Are my network configurations or IP lists safe?
- Yes. The IP Range Generator computes everything locally in your browser's execution thread. No server connections, network packets, or API fetches are triggered, ensuring your internal corporate IP layouts are completely secure.
- Why is the generated IP list capped?
- A large subnet like a /16 block contains 65,536 hosts, and a /8 contains over 16 million hosts. Attempting to render hundreds of thousands of HTML elements will freeze or crash browser tabs. The display cap limits visual listing while maintaining accurate calculation stats.
- What is the difference between network hosts and usable hosts?
- In a standard IPv4 subnet, the first address in the block is reserved as the Network ID, and the last address is reserved as the Broadcast address. These two addresses cannot be assigned to individual devices, so the number of usable hosts is always the total hosts minus two.
- How does the start-end IP range calculation work?
- The start-end range mode parses both IP addresses, translates them into 32-bit unsigned integers, and counts the difference. It iterates through the span to list each address sequentially, which is perfect for mapping non-standard host pools.
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Master this tool with Guides & Articles
Learn the workflows, common mistakes, and advanced techniques behind IP Range Generator with our deep-dive educational content.
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