Code Tools

PortJar

by PortJar · Free

Free network engineer toolkit — 29 tools covering DNS, WHOIS, port/TLS check, SPF/DMARC, CIDR calculator, and encoders in one place. No signup, no install.

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4.0

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📋 Editorial Review

In-Depth Editorial ★ Editor's Pick

PortJar Review 2026: 29 Network Tools in One Place, Free, No Signup

PortJar consolidates DNS lookup, WHOIS, port checking, TLS inspection, SPF/DMARC validation, CIDR calculator, and more into one clean interface. Free, no account, no install. The bookmarks folder killer for network engineers.

✎ pat bob 🕑 7 min read 👁 11 views

8.4

Score

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⭐ User Reviews

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★★★★☆

4/5 03 May 2026

The bookmarks folder killer for network engineers

“Finds vulnerabilities traditional scanners miss. Fix prompts per finding are a huge time saver — paste straight into Cursor or Claude Code. PDF report is board-ready out of the box.”

By AITools

✓ Pros

DNS, TLS, SPF, CIDR, port checking all in one tab with no signup. Client-side tools run entirely in browser — nothing sent to server. Completely free, fast load times, clean JSON output on everything.

✗ Cons

Rate limit after 10 server-side requests is frustrating during heavy sessions. No API for pipeline integration. No saved history or session persistence. Some tool gaps for power users.

⚖ Comparisons

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PortJar vs MXToolbox (2026): All-in-One Network Toolkit vs Email Specialist

PortJar covers 29 network tools in one free interface — DNS, port, TLS, SPF, CIDR and more. MXToolbox specialises in email deliverability and DNS with deeper diagnostic depth. Two different tools for overlapping but distinct use cases.

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