Windows
Step 1. Go to Start and type "cmd". Right-click on it and select "Run as administrator".
Step 2. Enter the command: "ipconfig /flushdns" and press Enter.
Step 3. You will now receive confirmation that it has been cleared!
Mac/Apple
Step 1. Open Terminal via Applications
Step 2. Execute the command (without quotes " ") corresponding to your macOS version and press Enter:
Version: macOS Sierra 10.12, macOS High Sierra 10.13 through macOS Sequoia 15.x
Command: "sudo killall -HUP mDNSResponder"
Version: OS X 10.11
Command: "sudo dscacheutil -flushcache"
Version: OS X 10.10.4 (or higher)
Command: "sudo dscacheutil -flushcache"
Version: OS X 10.10
Command: "sudo discoveryutil udnsflushcaches"
Version: OS X 10.9
Command: "dscacheutil -flushcache; sudo killall -HUP mDNSResponder"
Version: OS X 10.7 – 10.8
Command: "sudo killall -HUP mDNSResponder"
Version: OS X 10.5 – 10.6
Command: "sudo dscacheutil -flushcache"
Step 3. When prompted for a password, enter it and proceed.
If the situation is still not resolved after clearing the DNS, your network may still have DNS cache. Restarting your router often helps in this case. If that does not work either, you will unfortunately have to wait a little longer until this cache clears automatically.