Trying to create Manual IP Configuration, however, I get a error

Hello,
I am trying to create a manual IP address configuration on my MacBook. My router's IP is 10.1.1.1 and I need to make my Mac's static IP address 10.1.1.10. It was working for a while, however, I am now receiving the following error message when trying to connect to the internet:
10.1.1.10 is in use by 00:23:df:d9:cf:64
I looked up the MAC address, 00:23:df:d9:cf:64 and it is apparently manufactured by Apple, Inc. I have taken a look at the IP configurations of everything that is made by Apple in my house including: Macs, iPhones, iPods, etc and none of them have anything to do with 10.1.1.10. Please help me solve this issue and hopefully get the IP address up and running again.
Thanks a lot!

shmootz's router may not allow port forwarding at all if it (the router) is configured to hand out DHCP addresses to clients, hence his decision to go with static addresses rather than DHCP with manual address. I used to have a router that behaved like that.
shmootz, did you check both the airport panel and the ethernet panel on each computer? You know that the two interfaces will have different MAC addresses, right?
If you did not check both interfaces on each computer, I think you will need to look in your system preferences network advanced airport and ethernet panels on all of your computers and see if one of the interfaces has that 00:23:df:d9:cf:64 MAC address and manually pair it up with that 10.1.1.10 IP address.
It would be a lot nicer if you could just flush some table to clear the mapping of MAC addresses to IP addresses but I don't know where that info would be stored.

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