Developer

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

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