Mac DNS Lookup Failed

Mac "DNS lookup failed" error means macOS cannot resolve a domain name to an IP address, preventing connection to websites or services. This guide covers everything you need to know about this topic, including common causes, step-by-step solutions, and answers to frequently asked questions.

Here are the key things to understand: Safari or browser cannot resolve the website address. DNS server is unreachable or not responding. Can affect all browsers and network applications. Often occurs after network configuration changes. Understanding these fundamentals will help you diagnose and resolve this issue more effectively.

The most common reasons this occurs include: DNS server is down or unreachable. Incorrect DNS configuration. ISP DNS server issues. macOS DNS cache corrupted. Identifying the root cause is the first step toward finding the right solution.

To resolve this, follow these recommended steps: Flush DNS cache: sudo dscacheutil -flushcache && sudo killall -HUP mDNSResponder. Change DNS to 8.8.8.8 and 8.8.4.4 in Network preferences. Renew DHCP lease in Network preferences. Restart Wi-Fi or Ethernet connection. If these steps do not resolve the issue, consider consulting additional resources or a qualified professional.

This article is part of our Mac Error Codes collection on Error Codes Wiki. We provide comprehensive, up-to-date information to help you find solutions quickly.