as IP address spaces are allocated to different ASes, there must be an API or database somewhere where I can find all addresses an AS can originate ?
Is there any database of Autonomous Systems (AS) and IP address spaces an AS is allocated?
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Yes there is such a database. You can find it on the RIPE web site. There is also an API to query the database with your custom application:
https://labs.ripe.net/ripe-database/database-api/api-introduction
or if you just need to search from the web page you can use the search button at this page:
http://www.ripe.net/data-tools/db