identify by FCC ID

Products after April 13, 1998
First 3 characters are vendor code, following 14 are product code.
-  
Products before April 13, 1998
First 3 characters are vendor code, following 8 are product code.
This database is no longer updated by the FCC.
 

As an alternative you can search by the BABT number if your product has one.
BABT Number (UK only) for telecommunications products
Approval Number
Product Name
Product Description
Company Name