IOS images

I've been working on Cisco Routers/Switches/ASA's for a while now, but I have never looked into upgrading the IOS, since all my equipment has had what I needed. Now I have ran into needing an upgrade, I know how to do this, but I'm not actually sure where to get the IOS' from. I've seen a lot of threads about uploading through FTP and TFTP. Just wondering where you got your images from?
2017 Certification Goals:
CCNP R/S
CCNP R/S
Comments
CCNP R/S
You do.
LAN Access Switch and Access Point images had been available in the past with a guest level Cisco account -- but I'm not sure if that changed when Cisco announced they would track downloads (starting in January 2011) to insure people were only downloading images they had a SmartNet contract for.
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