| What it does | Free online network diagnostics and developer tools for engineers and IT professionals
| Stable domains for local development ports, eliminating conflicts with free open-source tunnels and paid cloud options
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| Stage | Not given
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| Founded | Not given
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| Based in | BD
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| Pricing model | Free
| Freemium
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| Pricing | Web Utility Suite: Free forever with complete access to all web-based diagnostic tools via browser, unlimited queries, no registration required. Programmatic API: Coming Soon.
| Free and Open Source: $0 (unlimited local tunnels, open source); Professional: $49/mo or $490/yr (unlimited cloud tunnels, visitor auth, feedback comments); Team: $149/mo or $1,490/yr (everything in Professional plus unlimited members, teams, shared subdomains, approvals, organization billing); Ente
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| Key features | - IP Lookup with geolocation, ISP, and ASN detection
- DNS Lookup and query of multiple record types (A, AAAA, MX, CNAME, TXT, NS, SOA, CAA, PTR)
- Subnet Calculator for IPv4 CIDR blocks and network calculations
- Port Checker for TCP port connectivity testing
- SSL Certificate Checker with expiration and TLS protocol verification
- WHOIS Lookup for domain registration details
- JSON Formatter and Validator with tree view and syntax error detection
- Base64 Encoder and Decoder with file and image support
- cURL to Code Converter supporting 7 programming languages
- UUID v4 and UUID v7 generator with RFC 9562 compliance
| - Stable local domains (*.portzero.local) for processes and containers
- Cloud tunnels (*.tunnel.portzero.cloud) with HTTPS for LAN and internet access
- Support for multiple programming languages
- Git worktree support with per-branch URLs
- AI agent integration with MCP server
- Visitor authentication and access control
- Feedback comments on live tunnels
- Team access policies and approvals
- Audit log (Enterprise plan)
- Organization billing with no per-seat charges
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| What makes it different | - 100% free with no account, email, or payment required
- Native Node.js execution for sub-second response times without queue delays
- Privacy-focused with zero query logging and strict SSRF security filters
- 28 tools in one place covering both network diagnostics and developer utilities
- All tools run in browser with no software installation or configuration required
| - Eliminates port conflicts by assigning stable virtual domains instead of port numbers
- Free and open source for local use; no additional cost for cloud features on paid plans
- Flat pricing with no meters, overages, or per-seat charges
- Agent-ready with native MCP server integration for AI coding agents
- Works across multiple OS and languages with zero port bookkeeping required
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| Free plan | Not given
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| Open source | Not given
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| Platforms | Not given
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| Public API | Not given
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 3 ● no change since last check | 1 ● no change since last check |
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| Trust Flow (Majestic) | 0 | 4 |
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| Citation Flow (Majestic) | 20 | 26 |
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| Referring domains (Majestic) | 4 | 135 |
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Port Zero