Where is this listener service Originated from?

I appreciate any input on where the listener service is originated from for the following scenario :
===========================
Listener.ora File
===========================
SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = CLRExtProc)
      (ORACLE_HOME = E:\12c\product\12.1.0\dbhome_1)
      (PROGRAM = extproc)
      (ENVS = "EXTPROC_DLLS=ONLY:E:\12c\product\12.1.0\dbhome_1\bin\oraclr12.dll")
LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
      (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
=======================
---End of Control File
=======================
=======================
Listener Services
=======================
LSNRCTL> SERVICE
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1521)))
Services Summary...
Service "CLRExtProc" has 1 instance(s).
  Instance "CLRExtProc", status UNKNOWN, has 1 handler(s) for this service...
    Handler(s):
      "DEDICATED" established:0 refused:0
         LOCAL SERVER
Service "orcl.Racki-PC" has 1 instance(s).
  Instance "orcl", status READY, has 1 handler(s) for this service...
    Handler(s):
      "DEDICATED" established:0 refused:0 state:ready
         LOCAL SERVER
Service "orclXDB.Racki-PC" has 1 instance(s).
  Instance "orcl", status READY, has 1 handler(s) for this service...
    Handler(s):
      "D000" established:0 refused:0 current:0 max:1022 state:ready
         DISPATCHER <machine: RACKI-PC, pid: 1860>
         (ADDRESS=(PROTOCOL=tcp)(HOST=Racki-PC)(PORT=49285))
Service "racki.racki-pc" has 1 instance(s).
  Instance "orcl", status READY, has 1 handler(s) for this service...
    Handler(s):
      "DEDICATED" established:0 refused:0 state:ready
         LOCAL SERVER
The command completed successfully
========================================
Services Originated from........
========================================
Service "CLRExtProc" has 1 instance(s).
  Instance "CLRExtProc", status UNKNOWN, has 1 handler(s) for this service...
=======================================================
SID_NAME = CLRExtProc   <--- The above is originated from Listener file Entry
=======================================================
Service "orclXDB.Racki-PC" has 1 instance(s).
  Instance "orcl", status READY, has 1 handler(s) for this service...
========================================================================
dispatchers=(PROTOCOL=TCP) (SERVICE=orclXDB)   <--- The above is originated Control file Entry
========================================================================
Service "orcl.Racki-PC" has 1 instance(s).
  Instance "orcl", status READY, has 1 handler(s) for this service...
==========================================================
service_names=orcl.Racki-PC   <--- The above is originated Control file Entry
==========================================================
Service "racki.racki-pc" has 1 instance(s).
  Instance "orcl", status READY, has 1 handler(s) for this service...
=================================
Where is this service Originated from?
==================================
I have PDB named racki running
SQL> select name from v$services;
NAME
racki.racki-pc
orclXDB
orcl.Racki-PC
SYS$BACKGROUND
SYS$USERS
Thank you very much for your input in advance.
Racki

It looks like your database is using automatic service registration (most do these days) in which case entries in the listener.ora aren't generally needed.
Justin

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