Build, Manage, and Monitor Your Domains
Use NetworkCalc's free online network calculators and APIs for home and corporate networking, presented simply.
We offer free REST APIs for system administrators, network administrators, developers, and home network users. Perform network calculations for subnets and convert between binary, decimal, hexadecimal, and octal. Verify your website DNS records, validate SPF records, check your website's SSL certificates, and stay aware of changes that impact your domains.
Use the Free Tools
Online Subnet Calculator
DNS Tools
Security Tools
Binary Converter
Stay Current on Industry News
Keep informed about emerging technologies, security threats, and simple, but effective strategies for building, managing, and monitoring your domains and networks.
Never miss an opportunity to take advantage of more of NetworkCalc's free tools and learn new techniques for improving your people, processes, and technologies.
Recent Articles
A detailed guide on the 10 network security practices you can start today to protect your network from hacking.
Know how to avoid IP address conflicts on your network using DHCP, static assignment, monitoring, and other a simple strategy for allocation IP addresses.
Get control over who can send email from your domain to reduce spoofing attacks.
Integrate the Free APIs
Access free REST APIs for all of the available tools on NetworkCalc. Detailed API documentation is available for the online subnet calculator, DNS tools, security tools, and binary converter.
Additional APIs are available if you register for a NetworkCalc account. This will allow you to save subnets and domains you work with regularly, track the configuration of your website over time, and perform queries quickly.
Get More out of NetworkCalc
NetworkCalc has everything you need to build, manage, and monitor your domains and websites.
We help you simplify domain management with a wide range of easy-to-use tools.
Get access to network APIs that you can integrate into your environment to supercharge your network.
About NetworkCalc
NetworkCalc is a suite of free online tools and APIs for managing your IP subnets, website security, and home or corporate networks.
NetworkCalc's tools are perfect not just for Network Administrators, System Administrators, and Email Administrators, but are also great for IT support, home network users, and students.
Whether you just need to do a quick subnet calculation or you're looking to build, manage, and monitor complex networks, our tools are available to you 24/7.
Try the network tools and remember to bookmark and save and share your favorites:
| Online Tools | APIs |
|---|---|
| Subnet Calculator | Subnet Calculator API |
| DNS Lookup | DNS Tools API |
| WHOIS Lookup | |
| SPF Validator | |
| What is my IP? | |
| Security Tools | Security Tools API |
| Binary Converter | Binary Converter API |