Use !asn to see information for an Internet Autonomous System.
Autonomous System Numbers (ASNs) are used in the Border Gateway Protocol (BGP) to identify an IP network managed or connected to the Internet by a single organization.
Usually, you do not need to prefix an ASN with !asn
Use the prefix !asn and add the string siblings at the end of your query to see other Autonomous Systems registered by the same organization, if any.