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Cisco's website is their feature navigator tool. This allows you to search several different ways:
1) Image name as displayed in a sh ver
(example: System image file is "flash:/c3550-i5q3l2-mz.121-14.EA1a.bin")
2) by Platform
(example: 2500, 802, UBR905)
3) Serial number as displayed in a sh diag
4) Or by IOS major release
The tool can be found here.
In order to access the tool from Cisco you need a CCO account. CCO accounts are free and simple to set up. You can register for a CCO here.
Starting with the new line of routers and switches, there is no longer these kind of confusion since there is only one IOS image file to deal with which is a Universal IOS image file. A lot of features have been included in the basic IOS image. However for those who needs advanced services such as OSPF, BGP, EIGRP (part of Advanced IP Services) or IPSec (part of Advanced Security), note that you need advanced license in order to use.