For IP addresses there are 10.x.x.x , 192.168.x.x IP address that can be used for private networks. Is there something similar for MAC address of network cards that can be safely used without applying for the permission from IEEE？
+3
A:
Yes, you can use a "Locally Administered Address" http://standards.ieee.org/regauth/groupmac/tutorial.html
Tergiver
2010-07-13 11:03:23
Thanks for your reply.Are you saying that the following(48bit) is legal?(MSB) (LSB)xx10 xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxxx may be 0 or 1
supernewbie
2010-07-13 11:20:14
The local/universal bit is the second least significant bit of the most significant byte of the address. Try the Wikipedia link, maybe it's clearer: http://en.wikipedia.org/wiki/MAC_address
Tergiver
2010-07-13 13:37:18
A:
In addition to what @Tergiver correctly said, you need to be careful about the ordering in which the bits are sent (it may not be obvious). If my calculations are correct, this means that the MAC address (as normally written) must start with x2, x6, xA or xE (where x is in [0-F]).
(The ones I've been given my network administrator start with 0E:)
Bruno
2010-07-13 14:07:13