How to Change DNS Settings on Mac

Step-by-step guide to changing DNS on macOS Sequoia, Sonoma, and Ventura. Covers Cloudflare 1.1.1.1, Google 8.8.8.8, Quad9, and how to verify the change worked.

2026-05-16

How to Check Open Ports on Mac: lsof, netstat, and nc

Check open ports on Mac using lsof -i :3000, netstat, and nc. Covers local port checking and testing remote hosts, with real command output examples.

2026-05-16

How to Flush the DNS Cache on macOS (Sequoia, Sonoma, Ventura)

Learn how to clear your DNS cache on macOS with one terminal command. Fixes stale DNS records after domain changes, broken redirects, and weird resolution issues.

2026-05-16

How to Run Diagnostics on a Mac: Apple Diagnostics and Beyond

Learn how to run Apple Diagnostics on any Mac to test hardware, read error codes, and know when to escalate. Plus what to do when hardware passes but connectivity fails.

2026-05-16

How to Run Traceroute on Mac: Command, Output, and What It Means

How to run traceroute on Mac, read every hop, spot slowdowns and firewalls, and use a GUI if you'd rather skip Terminal. Covers macOS Sequoia and later.

2026-05-16

macOS Network Diagnostic Tools: What's Built In, What's Missing

A complete guide to mac network diagnostic tools: Wireless Diagnostics, Terminal commands, what Apple removed in Monterey, and free GUI alternatives.

2026-05-16

nslookup on Mac: DNS Lookup Commands and When to Use Each

How to use nslookup, dig, and host on Mac for DNS lookups. Includes real-world examples for checking propagation, MX records, and debugging wrong IP addresses.

2026-05-16

Troubleshooting Slow Internet on Mac

Use network diagnostic tools to find out why your Mac's internet is slow. A systematic approach using ping, traceroute, and speed tests.

2026-01-14

Apple Killed Network Utility. What to Use Now

Network Utility is gone from macOS. Learn why Apple removed it and what alternatives exist for ping, traceroute, DNS lookup, and port scanning.

2025-12-03