Can't connect to TCP/IP printer with undescore "_" in the IP I have a wireless printer that's connected to our private LAN in our workplace. There is a weird configuration for the printer that it requires two printers to be added. For color - 192.168.51.xxx and one for grayscale - 192.168.51.xxx_1 &lt;---
There's a problem on MacOS that says it cannot connect to a printer with that IP but on windows it runs completely fine. The company previously worked with another IT company and they got it set up on one macbook in the entire workplace, but I cannot replicate the steps that they've taken. Maybe there's other ways to add a printer, besides the regular control panel?

I've only seen posts about ports, but not with this kind of IP as it's unusual.

The printer model is - Konica Minolta INEO+ 220
underscore “_” in the IP


IP address does not contain an underscore.

Wiki: https://en.wikipedia.org/wiki/IPv4#Addressing

192.168.51.xxx_1 is the Port Name, not the IP address of your printer, port name is auto-generated and "_#" is added to avoid duplicates names. So if you are using 192.168.51.xxx_1 to connect to the printer it will not work as this is not the IP address of your printer.