SQL> CREATE TABLE TST_TABLE1(
  2                          ID   NUMBER,
  3                          NAME VARCHAR2(10 CHAR)
  4                         )
  5    PARTITION BY RANGE (ID) INTERVAL(5)
  6      (
  7       PARTITION P_INITIAL VALUES LESS THAN (5)
  8      )
  9  /

Table created.

SQL> INSERT INTO TST_TABLE1
  2  SELECT  LEVEL,
  3          CHR(ASCII('A') + MOD(LEVEL,5) - 1)
  4    FROM DUAL
  5    CONNECT BY LEVEL <= 7
  6  /

7 rows created.

SQL> SELECT  *
  2    FROM  TST_TABLE1
  3  /

        ID NAME
---------- ----
         1 A
         2 B
         3 C
         4 D
         5 @
         6 A
         7 B

7 rows selected.

SQL> SELECT  T.*,
  2          O.SUBOBJECT_NAME PARTITION_NAME
  3    FROM  TST_TABLE1 T,
  4          DBA_OBJECTS O
  5    WHERE T.NAME = 'A'
  6      AND O.OBJECT_ID = DBMS_MVIEW.PMARKER(T.ROWID)
  7  /

        ID NAME PARTITION_NAME
---------- ---- --------------
         1 A    P_INITIAL
         6 A    SYS_P105037

SQL> SELECT  T.*,
  2          O.SUBOBJECT_NAME PARTITION_NAME
  3    FROM  TST_TABLE1 T,
  4          DBA_OBJECTS O
  5    WHERE T.NAME = '@'
  6      AND O.OBJECT_ID = DBMS_MVIEW.PMARKER(T.ROWID)
  7  /

        ID NAME PARTITION_NAME
---------- ---- --------------
         5 @    SYS_P105037

SQL>