V$IP_ACL provides information about access control to database services from network hosts.
The database service name
The host being granted access to the SERVICE_NAME. The host can be a hostname, dotted-decimal IPv4 or heximal IPv6 address. Wildcard "*" for IPv4 and Classless Inter-Domain Routing (CIDR) format is allowed.
The ID of the container to which the data pertains. Possible values include:
0: This value is used for rows containing data that pertain to the entire CDB. This value is also used for rows in non-CDBs
1: This value is used for rows containing data that pertain only to the root
n: Where n is the applicable container ID for the rows containing data
This view is available starting with Oracle Database 12c Release 2 (188.8.131.52).