About NetworkCheckr
NetworkCheckr is a free collection of browser-based networking tools and plain-English educational guides. No signups, no software to install, no data harvested. Just practical utilities and clear explanations for anyone who works with networks.
Whether you need to quickly look up an IP address, calculate a subnet, or understand how DNS works under the hood, NetworkCheckr is built to get you the answer fast and help you understand the “why” behind it.
Every tool runs entirely in your browser. Every guide is written to be genuinely useful, not to hit a word count. This site exists because we believe networking knowledge should be accessible to everyone, not locked behind paywalls or buried in jargon.
What We Offer
Free Networking Tools
Our growing toolkit covers the utilities that IT professionals, developers, and students reach for most often. All seven tools are available right now at the Network Tools hub:
Educational Guides
Alongside the tools, we publish a growing library of guides that explain networking concepts in plain English. Each guide pairs real-world context with technical detail so you understand not just what to do, but why it works that way. Topics range from beginner-friendly introductions to subnetting and DNS records all the way to practical walkthroughs for working professionals.
Who This Is For
NetworkCheckr is designed for anyone who works with networks or wants to learn how they work:
- IT Professionals
- System Administrators
- Network Engineers
- Web Developers
- CompTIA & CCNA Students
- Home Lab Enthusiasts
- Small Business Owners
- CS & IT Students
Whether you are studying for your CompTIA Network+ or CCNA certification, troubleshooting a production DNS issue at 2 AM, or setting up networking for a small business, these tools and guides are built with your workflow in mind.
Our Approach
Privacy-First Tools
Every tool runs entirely in your browser. We do not store your queries, log your IP lookups, or track your usage on the server side. Your data stays on your machine.
Practitioner-Written Content
Our guides are written by people who actually configure networks, troubleshoot outages, and build infrastructure, not by content farms chasing keywords. Every article is reviewed for technical accuracy before it goes live.
Free, No Strings Attached
Every tool and every guide on NetworkCheckr is completely free. No accounts to create, no premium tiers, no software to download. Open a page and start using it.
Who’s Behind NetworkCheckr
NetworkCheckr was built by John Herwick, a web developer and former Big 4 consultant who spent years advising federal and private sector CIOs and their teams on information technology Capital Planning and Investment Control (CPIC).
That combination — years of advising senior IT leadership on technology strategy alongside hands-on web development skills — is what drives NetworkCheckr. The goal is to make networking concepts accessible and practical, backed by tools that actually work, written by someone who understands both the business and technical sides.
Expertise and Editorial Standards
We take accuracy seriously. The content on NetworkCheckr is created and maintained by professionals with hands-on experience in network engineering, system administration, and software development.
Our editorial process includes:
- Technical review — every guide is reviewed by at least one practitioner with real-world networking experience before publication
- Authoritative sourcing — we reference RFCs, official vendor documentation, IANA registries, and recognized industry standards rather than relying on secondhand information
- Regular updates — networking standards and best practices evolve, and we revisit published content to ensure it stays current and accurate
- Clear attribution — when we cite specifications or standards, we link to the primary source so you can verify and dig deeper on your own
We believe that trustworthy technical content should demonstrate genuine expertise, not just claim it. That is why our guides include specific commands, real configuration examples, and explanations grounded in how protocols actually behave in production environments.
Get in Touch
Have a question, suggestion, or correction? We welcome feedback from the community. Whether you have spotted an error in a guide, want to request a new tool, or just want to say hello, we would love to hear from you.
Visit our contact page to reach the NetworkCheckr team.
Contact Us