SQL> ed
Wrote file afiedt.buf

  1  begin
  2    dbms_network_acl_admin.assign_acl (
  3    acl => 'utlpkg.xml',
  4    host => '*',
  5    lower_port => 1,
  6    upper_port => 10000);
  7* end;
SQL> /

PL/SQL procedure successfully completed.

SQL> select host, lower_port, upper_port, acl, aclid
  2  from dba_network_acls
  3  where ACL='/sys/acls/utlpkg.xml';

HOST
--------------------------------------------------------------------

LOWER_PORT UPPER_PORT
---------- ----------
ACL
--------------------------------------------------------------------

ACLID
--------------------------------
*
         1      10000
/sys/acls/utlpkg.xml
43748F35D57D4372805BAED3A9978D0F

DECLARE
  P_URL_I VARCHAR2(200);
  P_LINK_I VARCHAR2(200);
  v_Return BOOLEAN;
BEGIN
  P_URL_I := 'http://www.toppica.com/submit.php';
  P_LINK_I := 'www.xlntseo.com';

  v_Return := SEO_VERIFICATION.VERIFY_LINK(
    P_URL_I => P_URL_I,
    P_LINK_I => P_LINK_I
  );
  IF (v_Return) THEN 
    DBMS_OUTPUT.PUT_LINE('v_Return = ' || 'TRUE');
  ELSE
    DBMS_OUTPUT.PUT_LINE('v_Return = ' || 'FALSE');
  END IF;
END;

ORA-29273: HTTP request failed
ORA-06512: at "SYS.UTL_HTTP", line 1674
ORA-24247: network access denied by access control list (ACL)
ORA-06512: at "XLNTSEO.SEO_VERIFICATION", line 8
ORA-06512: at "XLNTSEO.SEO_VERIFICATION", line 30
ORA-06512: at line 9
29273. 00000 -  "HTTP request failed"