Conversion from CHAR HEX

hi guys,
I am trying to convert a simple char value to HEX but I am getting Error.


*MyTable:*

CREATE TABLE mytable (from_ip CHAR(20), to_ip CHAR(20));

*I have below values in the Table:*


fm_db_Server1=# select * from operator;
           from_ip        |        to_ip
--------------------+----------------------
 202.153.087.128      | 202.153.087.159
 196.192.015.000      | 196.192.015.063
(2 rows)


I am trying to extract the 1st part of the IP and convert to the HEX as
below:


fm_db_Server1=# *select to_hex(to_number(substr(from_ip, 1, 3), '999'))  as
price from operator;*
/ERROR:  function to_hex(numeric) does not exist
LINE 1: select to_hex(to_number(substr(from_ip, 1, 3), '999'))  as p...
               ^
HINT:  No function matches the given name and argument types. You might need
to add explicit type casts./



 I am not able to figure it out what is wrong here. Can Any body point out
what is wrong here.
Thanks is advance.




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