Best Free Networking Tools Online (2026)
Whether you're debugging DNS issues, testing APIs, or calculating subnet ranges, having the right networking tools can save hours of frustration. But many popular platforms hide features behind paywalls or require account creation. We've compared the top networking tools to help you find the right option for your workflow.
| Feature | Fixie Networking Tools | MXToolbox | Postman | Hoppscotch |
|---|---|---|---|---|
| Price | Free forever | Free (limited) / $129-399/mo | Free (1 user) / $14/user/mo | Free & open source |
| Signup Required | No | Yes (for advanced features) | Yes | Optional |
| Privacy / Data Handling | No data stored | Account-based storage | Cloud-synced collections | Self-hostable or cloud |
| DNS Lookup | Yes, unlimited | Yes (comprehensive suite) | No | No |
| Subnet Calculator | Yes, unlimited | Yes | No | No |
| API Testing | Basic (request builder) | No | Yes (industry-standard) | Yes (full-featured) |
| Request Collections | No | N/A | Yes (25 runs/mo free) | Yes, unlimited |
| Team Collaboration | No | Yes (paid plans) | Yes (paid only) | Yes (shared workspaces) |
| Blacklist Monitoring | No | Yes (core feature) | No | No |
| Email Diagnostics | No | Yes (DMARC, SPF, DKIM) | No | No |
| Protocol Support | HTTP/HTTPS only | SMTP, DNS, HTTP | REST, GraphQL, WebSocket, gRPC | REST, GraphQL, WebSocket, MQTT, SSE |
| Cron Expression Builder | Yes, visual builder | No | No | No |
Our Verdict
The right networking tool depends entirely on what you're trying to accomplish. MXToolbox is the industry leader for email deliverability and DNS diagnostics - if you manage email infrastructure professionally, its blacklist monitoring and DMARC testing are unmatched (though full features require a paid plan starting at $129/month).
For API testing, Postman remains the gold standard for professional development teams, offering collections, environments, mock servers, and comprehensive testing capabilities. However, the free plan limits teams, pushing users toward the $14/user/month paid plan. Hoppscotch provides an excellent open-source alternative with unlimited team collaboration, support for REST, GraphQL, WebSocket, MQTT, and more - all completely free.
Fixie's networking tools excel at instant, no-signup access to common tasks: DNS lookups, subnet calculations, quick API requests, and cron expression building. You won't get saved collections, team workspaces, or email monitoring, but for quick diagnostic work or learning purposes, it offers a clean, privacy-first experience with no account barriers.