Cisco IOSv is a form factor of IOS, designed to run as a Linux process (often inside KVM). It is intended for:
Legitimate Cisco IOS release names follow patterns like: i86bilinuxl3adventerprisek9m21573may2018bin portable
: This marks the specific release version and the build date ( ), which is relatively recent for IOU images. The "Portable" Adventure Cisco IOSv is a form factor of IOS,