While updating or changing your site, it might be helpfull to clear your DNS cache through command prompt to clear any inaccurate data.
Clear DNS Cache on Windows
Depending on what Windows version you use (Windows 7, 8 or even Windows 10) the first step is to search the CMD program.
1. Search CMD
2. Right click -> Open as Administrator
3. Run the following command;
Windows IP configuration successfully flushed the DNS Resolver Cache.
Clear DNS Cache on Mac OS
To clear the DNS cache on your Mac OS you need to follow the following steps;
1. Go to Applications
2. Click Utilities
3. Click Terminal
Now depending on your MAC OS version, type the following command;
MAC OS 10.10;
sudo discoveryutil mdnsflushcache
MAC OS 10.7 10.8 10.9;
sudo killall -HUP mDNSResponder
MAC OS 10.5 10.6;
sudo dscacheutil -flushcache
If the command succeeds the system does not return any output. Make sure you know the admins password to execute this command.