Here are the results of your search through the public section of the IEEE Standards OUI database report for 00-90-1A:
00-90-1A (hex) UNISPHERE SOLUTIONS 00901A (base 16) UNISPHERE SOLUTIONS 5 CARLISLE ROAD WESTFORD MA 01886 UNITED STATES
Your attention is called to the fact that the firms and numbers listed may not always be obvious in product implementation. Some manufacturers subcontract component manufacture and others include registered firms' OUIs in their products.