How to find Mac address

How to find Mac address

You may have many options to find an device's Mac address.

Find it from your computer’s arp tables if you know the IP address (see below case).
If there is a router in your network, you may be able to find the both IP and Mac addresses.
With a Cisco equipment, you may use "show arp" command.
Use ezconfig to find Mac address

Case study:

I know my another Laptop IP is 192.168.10.11. When I do

C:\Documents and Settings\blin>arp -a 192.168.10.11

No ARP Entries Found

The ARP table doesn’t have the IP information.

Then I ping it first to collect the data. After I do it again, I get the Mac address.

C:\Documents and Settings\blin>ping 192.168.10.11

Pinging 192.168.10.11 with 32 bytes of data:

Reply from 192.168.10.11: bytes=32 time=7ms TTL=128

Reply from 192.168.10.11: bytes=32 time=3ms TTL=128

Reply from 192.168.10.11: bytes=32 time=6ms TTL=128

C:\Documents and Settings\blin>arp -a 192.168.10.11

Interface: 192.168.10.100 --- 0x3

Internet Address Physical Address Type

192.168.10.11 00-05-5d-a6-dc-d5 dynamic

ipconfig

How to setup two IPs on a computer How to use MS DHCP to reserve an IP on MAC How to use TCP/IP without installing a NIC. How can I find a NIC MAC address? ...
http://www.howtonetworking.com/Networking/ipconfig.htm

IP conflict

Case Study - Event ID 4199 - The system detected an address conflict for IP ... From the Mac address, we find it is a D-Link wireless router added last week ...
http://www.howtonetworking.com/casestudy/ipconflict.htm

System has detected IP conflict

3) You can use ARP –a command to find the Mac address of other device. Or check this case study - System detected an address conflict for IP. Related Topics ...
http://www.chicagotech.net/troubleshooting/eventid4199.htm