Tracing connect users ipaddreses

Dear all,
I am using oracle 10g,i want to find out all the clients ipaddresses connected(current session) to my database.
I tried utl_inaddr.get_host_address(client_machine_name) but it returns some error.......
It means,i want to find out ipaddresses of those machine which displays in (machine) column of v$session
Please help me out from the above stated problem..
Thanks and Regards
Monoj

Below is the error message....
select username,sid, machine,UTL_INADDR.get_host_address(substr(machine,instr(machine,'\')+1))ip from v$session where type='USER' and username is not null order by machine;
select username,sid, machine,UTL_INADDR.get_host_address(substr(machine,instr(machine,'\')+1))ip from v$session where type='USER' and username is not null order by machine
ERROR at line 1:
ORA-29257: host hpclnpm.com unknown
ORA-06512: at "SYS.UTL_INADDR", line 35
ORA-06512: at "SYS.UTL_INADDR", line 40
ORA-06512: at line 1

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<NOEMBED>
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*** (I'll be brief ... I'm getting bored... probably the reader feel the same)
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blog show how to do it by the way). Again we can monitor specific application or use any filter in order to get only the sharepoint users
.... and i can continue for several days more :-) ...
"If there is a willing, then there's a way"
"If you can't do it, Then someone else probably can"
"Never say never"
I hope this help somehow :-)
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Tracing connect users ipaddreses

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