FWIU, your mac address and your ip address don't relate to each other in anyway. They are used together but one can not be derived from the other. There are several other ways to devine your ip address. Google IP address lookup and you can find it thru one of the links there.
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all active network cards have an ip address associated with their MAC address. Although the ip address can change and if you want to you can change it manually, The card must have one associated with it otherwise it cannot connect to the lan or the internet. In Windows ipconfig /all shows them In Linux ifconfig does a similar thing. i am running Ubuntu Linux and this is what I get on my laptop: wlan0 Link encap:Ethernet HWaddr 00:13:e8:d9:4f:01 inet addr:192.168.1.40 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::213:e8ff:fed9:4f01/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:146546 errors:0 dropped:0 overruns:0 frame:0 TX packets:102287 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:166932435 (166.9 MB) TX bytes:15046050 (15.0 MB) This is the MAC address: HWaddr 00:13:e8:d9:4f:01 this is the ip address: inet addr:192.168.1.40
From a Windows command prompt , IPCONFIG /ALL will show you the MAC address and lots more. If you just want to use a mouse: Start > Control Panel> Network Connections >Local Area Connection>Support> Details.
A mac address is a physical address assigned to a piece of hardware - there are programs to check the addresses of traffic (sniff) on your own network to find a piece of hardware. Once you get the internet involved the addresses become irrelevant because only the participants in a a data transaction would know each other's mac addresses, thus there is no definite way to look one up from the other. If you want your OWN external ip address go to http://www.whatismyip.com If you want to know your internal IP address use the start> run > 'command' (no quotes), and run ipconfig (type ipconfig, hit enter)
Easiest way is to click on START, then RUN. Type CMD into the box, then press ENTER. Type IPCONFIG into the new window then press ENTER. That will show you the address of your computer from the local network. It doesn't tell you anything about your address from the internet.
To find your internet address, you need to examine your router settings. This may be in the form of a webpage with its own IP address ( http://192.168.1.1 is the default of many routers) or a setup program. Somewhere there will be a 'connection status' type screen which will tell you the external address for your router. If you want to connect to your PC from the internet, you'll need to configure port forwarding in your firewalls. A MAC address is programmed into a network device during manufacture. An IP address is set by the user (static IP), or requested from another computer (DHCP).