I was looking at my wifi list as I do time to time and I noticed that my IP which should be 192.168.1.# wasn't there, in it's place was 169.254.19.##. Now I looked up that IP and it's some sort so could it be someone has hacked into my computer or not. This is a mac, i know that's looked down upon here but I also use Linux on my other box and an odroid. So should I panic? Also before this happened I was messing around with my local address to fix a wifi issue, changing 192.168.1.1 to .192.168.3.1 and vice versa. Also I keep getting this pop up box saying, Another device is using your computers IP address (192.168.1.1)

We can add this to your other thread about being 'hacked':
https://www.linuxquestions.org/quest...ed-4175676713/

No idea what you're saying about being 'looked down upon', but asking questions about Mac OS on a Linux forum isn't likely to get you answers, just like asking Linux questions on a Windows forum. That said, since you did some research, did you read the rest of it, or what you posted??? You (AGAIN) aren't 'hacked','intruded', etc....your computer didn't get an IP address. Why, we can't tell you...could be it was set to get a reserved DHCP address and when you changed your router hardware, it's trying to get the same address as another system, and can't. Could be the network adapter died, a cable is unplugged, or something else entirely.

Since you're getting told very plainly that another computer has the address you're requesting...**USE A DIFFERENT ADDRESS**

All that happened is that your machine was unable to get a DHCP lease so fell back to an APIPA address.
It sounds like you've been setting static IPs in a DHCP ranges and are getting conflicts when the router tries to assign that same IP. If you want a consistent IP you need to either assign something outside the DHCP range or configure a DHCP lease.

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