Query to find DB_LINK in an Oracle instance

Following query

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-- Query to find DB_LINK created in an instance

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SELECT obj.object_type         "Object Type",

       obj.owner               "Object Owner",

       obj.object_name         "Object Name",

       obj.status              "Object Status",

       dbl.db_link             "DB Link",

       dbl.username            "DB Link",

       dbl.host                "DB Host"

  FROM dba_objects  obj,

       dba_db_links dbl

 WHERE obj.object_name = dbl.db_link

   AND obj.object_type = 'DATABASE LINK';