I tried to change some DNS records today, and even after the TTL was over, I couldn't get the updated records on my notebook. I flushed the DNS cache on macOS but it didn't work. After some debugging, I found that my FRITZ!Box might be the culprit.

How to do it

Just go to:

Heimnetz > Netzwerk > Netzwerkeinstellungen > IPv4-Einstellungen

And then deactivate DHCP and reactivate it afterward. This will flush the DNS cache without the need for a restart. My changed DNS records were available right after doing this 🤪.