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 Apple Diagnostics on a Mac

Test your Mac hardware with Apple Diagnostics: the startup keys for Apple Silicon and Intel, what each reference code means, and what to do if it passes.

2026-05-16

How to Run Traceroute on a Mac (Terminal or GUI)

Run traceroute on a Mac and read the output: what each hop means, how to spot congestion and firewalls, and a GUI if you would rather skip Terminal.

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 Lookups with Examples

How to use nslookup, dig, and host on a Mac to check A, MX, and TXT records, confirm DNS propagation, and debug a domain pointing at the wrong IP address.

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