Comments on: What is a MAC Address?

By: Howard Farrar

Howard Farrar — Fri, 02 Dec 2011 12:22:28 +0000

Companies purchase MAC addresses in blocks of 2^24. If they need more than 2^24, they just buy more blocks. If you look at http://standards.ieee.org/develop/regauth/oui/oui.txt, you can see companies like Cisco listed many times

By: Shina Sheen

Shina Sheen — Fri, 02 Dec 2011 05:35:09 +0000

The first three bytes of the MAC is assigned to vendor ID. That leaves only the last three bytes for serial number. Does it mean that a vendor can manufacture only 2^24 devices after which the serial number gets depleted

By: Richard

Richard — Tue, 15 Feb 2011 12:21:06 +0000

External programs on the internet will only be able to show your IP address. If you want to see your MAC address, you need to follow the instructions in the post really.

By: what is my router ip address

what is my router ip address — Mon, 14 Feb 2011 22:00:55 +0000

Great post, but that won’t seem to make use of my router ip, any hints?

By: Richard

Richard — Sat, 06 Mar 2010 16:13:45 +0000

Changing your graphics card should not affect your MAC address at all. The MAC address would only change if you upgraded your network card on the computer

By: ryan@lan

ryan@lan — Sat, 06 Mar 2010 12:46:50 +0000

Does my mac adresse change if I upgrade my computer with some other hardware? For example change the graphic card?

By: Howard

Howard — Wed, 17 Sep 2008 09:37:08 +0000

> This means we could all have over 41,000 computers each

Not strictly true. We could have 41,000 network appliances each. I would hardly call my power switch or HiFi system a “computer”.

Now disposable items such as mobile phones have MAC addresses, that 41,000 each could start to look a lot smaller quite quickly. I think I must have used up around 25 already. Only 40,975 to go