THat can mean 3 things

that the router's ip address has changed
The router has lost it's connectivity or lastly
There may be a reset that was performed with the settings of the router,eg : the Encryption key may have been changed and your computer is off the router network.

For Windows:
Press the button with a window symbol on it (from the keyboard)
as well as the letter R at the same time.
A run window will open type in "CMD"
NOW in the black window that opens type in ipconfig and click on the enter button on the keyboard and you scroll through the window page you will get a default gateway that will be your router address if it's 0.0.0.0 or 169.254.254.254 then in the same window type in ipconfig /release(ipconfig ,a space and then release)
wait for about 5 minutes and then type in ipconfig /renew(ipconfig, a space and then renew).
Now type in ipconfig and you should get your default gateway(the ip address) of the printer

If this works that means the router has started working if it doesn't then please call up either your router company or your internet provider and they'll reset the router settings from their office.

If this helps you would appreciate a 4 thumbs up

thanks! THat can mean 3 things

that the router's ip address has changed
The router has lost it's connectivity or lastly
There may be a reset that was performed with the settings of the router,eg : the Encryption key may have been changed and your computer is off the router network.

For Windows:
Press the button with a window symbol on it (from the keyboard)
as well as the letter R at the same time.
A run window will open type in "CMD"
NOW in the black window that opens type in ipconfig and click on the enter button on the keyboard and you scroll through the window page you will get a default gateway that will be your router address if it's 0.0.0.0 or 169.254.254.254 then in the same window type in ipconfig /release(ipconfig ,a space and then release)
wait for about 5 minutes and then type in ipconfig /renew(ipconfig, a space and then renew).
Now type in ipconfig and you should get your default gateway(the ip address) of the printer If this works that means the router has started working if it doesn't then please call up either your router company or your internet provider and they'll reset the router settings from their office. If this helps you would appreciate a 4 thumbs up thanks!