Access Control Lists can now be decoded via SharePoint Ring. This allows you to inspect Access Control Entries for a specific object (e.g. Web or List). Note that the ACL text entry is limited to 65535 characters, however ACLs can technically be up to 2GB in size (database value is varbinary(max)). If you have an ACL that is larger than 65535 characters, feel free to contact me directly for an alternative solution.