osx change printer ip address without adding new printer

You can do this in the CUPS web interface with the following steps:

1. Open Terminal.app and run cupsctl WebInterface=yes. This enables the CUPS web interface
2. Open http://127.0.0.1:631/printers in your web browser
3. Click on the printer you want to change. From the "Administration" drop down, select "Modify Printer".
4. Log in with your local admin account
5. Select the new printer IP either from "Discovered Network Printers" or add it manually with "Other Network Printers". Make sure that you keep the same connection protocol as it says in "Current Connection" (for me, this was LPD).

Once you're done with this, Mac OS X will directly print to the new IP address. There is no need to reboot or so. If you want to disable the CUPS web interface again, run cupsctl WebInterface=no.

The configuration information is stored in a system file in /etc/cups/printers.conf. You could edit the file and just change the IP address, but you can easily run into permission problems and end up screaming with frustration.

Here are several options that should work; most require using the terminal command line.

• Pick your text editor of choice, launch it with administrator privileges, and edit the file directly.
  Example: using terminal, type: sudo vi /etc/cups/printers.conf
  (sudo will launch vi with adminstrator privileges; which will require that you enter your password.)

• Use sed to modify the file from the command line; here are some examples:

  • sed command line to change IP from 10.1.1.21 to 192.168.1.47, creating a new file:
    sudo sed -i.bak s/10\.1\.1\.21/192\.168\.1\.47/g printers.conf
    To verify the changes, type:
    sudo diff printers.conf printers.conf.bak
    
  • sed command to change all IPs from 10.1.1.x to 192.168.1.x (leaving final segments unchanged); this will backup the file to printers.conf.bak:
    sudo sed -i.bak s/10\.1\.1\./192\.168\.1\./g printers.conf

Hope that helps.