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But there is no "significance" of bytes in MAC addresses they are merely identifiers there is no concept of arithmetic with them their essential property (as far as the protocol is concerned) is uniqueness only. The standard *does* assume a significance of bits within an octet, and specifies physical-layer transmission bit-order and the I/G and U/L bits in terms of "Least Significant Bit". The standard only speaks of octets, and octets are transmitted in order one by one. There are merely the first octet through the nth octet (6 or 8). In my opinion, there is absolutely no need to confuse people with byte order in this instance, and a lot of confusion could be avoided by always referring to the octets by their order on the wire, "First octet" being the first one transmitted, etc. Calandoa ( talk) 16:23, 15 March 2016 (UTC)In various places, the text refers to "most significant byte", "most significant address octet", both mixing the 2 terms and assuming significance. It would be actually interesting to add a new paragraph ("transmission order") explaining these subtleties. And these points are quite important when trying to understand the Bluetooth protocol as in this special case, octets are transmitted in the wrong order (though BT spec pretends to be complying with IEEE 802-2001). The diagram is also just wrong (no byte significance, no opposite byte/order direction, no fixed bit order transmission). The third and fourth paragraphs are very confusing on this point and should be rewritten. It seems there is some agreement on this so I will try to do this. I propose the "Address details" section be rewritten to avoid all references to byte order. This seems completely wrong to me and can only lead to confusion. When I brought it to my office and connected it to my LAN I was able to connect. 94.118.87.120 ( talk) 20:42, 21 November 2018 (UTC)There is some formats of MAC addresses, I've read about them in "Computer Networks" by Andrew Tanenbaum.Is it possible for a PC to lose its MAC address configuration permanently? What I mean is, my PC crashed during a thunderstorm, after it came back on I could no longer access my network at home. The Apple iPhone mention seems advertising given the widespread default spoofing in much software these days (including Windows 10 Settings where default randomization can be ticked, and Linux Network Manager, which randomizes by default and has to be disabled in its configuration file to allow user MAC control). Of course, another problem could be a physical cabling problem. Usually power cycling the router will clear the problem. A number ISP provided home routers seem to suffer from a "no more IP addresses for you" problem. More likely, the router box providing DHCP leases for IP addresses has a problem. So that is why I am asking if it is possible for a PC to permanently lose a MAC address.From your description, the PC sounds fine. I then brought the PC home and reconnected it, in the hope that by some slim chance it would work, it did not. the remote host is off (except for Wake-on-LAN), David Harbaugh The "arp -a" works fine if the network is working properly. The command ipconfig/all shows the MAC address for all network devices. Lent ( talk) 19:32, 25 January 2010 (UTC) Fixed finding MAC under Windows XP The instructions for finding the MAC address under Windows XP recommended using arp -a, which shows the MAC of other machines on the Local Area Network. a static ARP/IP address pair has been entered in the local ARP table, so new MAC addresses for the static IP address are just tossed away, two hosts are trying to use the same IP address, so only the latest IP/ARP address pair is stored in the local ARP table, the ARP/IP address pair has timed out and been purged from the local ARP table. Proxy ARP is in use,(you get the Proxy's MAC address instead) Comments? - Hoary ( talk) 07:16, 23 January 2010 (UTC)Agreed. This involved taking one external link from this article, finding that it was irrelevant, taking another, finding that the explanation was outdated and/or obscure, and finally:I noticed in passing that with a Windows machine that's not grotesquely unsuited for today's internet, the command would beI realize that WP is not a compendium of "howto" manuals, but suggest that this information would be useful and worth inclusion in the article. Lent ( talk) 16:45, 25 January 2010 (UTC) Finding a MAC address I needed to find various MAC addresses of a GNU/Linux and a Mac OS X machine. the local host is not running the TCP/IP protocol :-)To attempt to get a MAC address on a remote subnet, say across a router,The NBTSTAT -A IP address and NBTSTAT -a remote_SMB_hostname commands will retrieve the remote MAC address for many systems, but Samba systems respond back with MAC Address = 00-00-00-00-00-00 instead. By this I mean games consoles, phones, PDAs etc etc.93.97.144.211 ( talk) 13:25, 18 February 2010 (UTC)Any device which transmits 802.11 frames must use a MAC address. — Preceding unsigned comment added by 74.96.165.138 ( talk) 14:36, 25 August 2011 (UTC) Do all WiFi capable devices have a MAC address? I'm doing some research into a potential software product and need to understand if all WiFi enabled products have a unique MAC address. Lent ( talk) 16:57, 25 January 2010 (UTC) To answer the original question: arp -i eth0 -n will show the mapping from IP addresses to MAC addresses on your local network. Darrell_Greenwood ( talk) 03:33, 25 January 2010 (UTC) Here's a search that yields ".edu" sites for these types of instructions. Wirepath program for macIf you're researching a commercial application, you should hire a professional engineer, rather than trusting what random people on Wikipedia say. Passive devices which only listen/monitor do not need a MAC address. Practically everything which can transmit ships with a UAA pre-programmed. Also, "Universally administered and locally administered addresses are distinguished by setting the second least significant bit of the most significant byte of the address", contradicts the diagram. Calling the least significant bit "bit 1" just creates confusion and reduces the perceived competence of the author. The value of a bit is 2 raised to the power of the bit number, therefore the least significant bit is bit 0.
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