From NirSoft Freeware
MACAddressView is a MAC address lookup tool that allows you to easily find the company details (company name, address, and country) according to the MAC address of a product.
MACAddressView also allows you to find MAC address records according to the company name, company address, or country name. After finding the desired MAC address records, you can save them into text/xml/HTML/csv file or copy them to the clipboard and paste them into Excel or other applications.
MACAddressView doesn't send any request to a remote server, it simply uses the internal MAC addresses database stored inside the .exe file.