# as-set An important object in the RIPE database is the AS-SET, this is typically what upstream providers and carriers use to generate prefix lists and filters for your ASN/network. To create one you should go [here](https://apps.db.ripe.net/db-web-ui/webupdates/create/RIPE/as-set) and input the following information MNT-BY which should be autofilled by default with your MNTer object assuming you have one (if you don't, go [here](https://learn.beako.net/books/ripe-ncc-objects/page/rolemaintainer-pair) and make one) AS-SET should be the name of your AS-SET, which can be anything so long as it isn't in use by someone else (it will complain if it is) tech-c and admin-c need a person role, which you can create by following [this page ](https://learn.beako.net/books/ripe-ncc-objects/page/person) If it doesn't exist, you will need to click the plus button and add the members subgroup, this is where you specify the AS-SETs and ASNs you want in your AS-SET, in the format of ASN, ASN, AS-SET Once you do that click submit and you have a new AS-SET! A further note is an AS-SET can contain only other AS-SETs, so you can chain down a clean structure like - AS-RTT - Root org AS-SET - AS-RTT-DS - downstreams of AS-RTT - AS-RTT-CORE - ASNs run by AS-RTT Note your new AS-SET will have the as-set section editable, this is an existing object [![image.png](https://learn.beako.net/uploads/images/gallery/2022-11/scaled-1680-/Dbfimage.png)](https://learn.beako.net/uploads/images/gallery/2022-11/Dbfimage.png)