Oracle Database Discussions

I use lsof command:
...
imapsvcd 24498 omu 48u IPv6 299237315 UDP localhost:33245
imapsvcd 24498 omu 49u IPv4 299237317 TCP localhost:41169->localhost:ncube-lm (CLOSE_WAIT)
imapsvcd 24498 omu 50u IPv6 299237390 UDP localhost:33254
imapsvcd 24498 omu 51u IPv4 299237392 TCP localhost:41171->localhost:ncube-lm (CLOSE_WAIT)
imapsvcd 24498 omu 52u IPv6 299237443 UDP localhost:33265
imapsvcd 24498 omu 53u IPv4 299237445 TCP localhost:41173->localhost:ncube-lm (CLOSE_WAIT)
imapsvcd 24498 omu 54u IPv6 299237480 UDP localhost:33267
imapsvcd 24498 omu 55u IPv4 299237482 TCP localhost:41174->localhost:ncube-lm (CLOSE_WAIT)
imapsvcd 24498 omu 56u IPv6 299237503 UDP localhost:33269
imapsvcd 24498 omu 57u IPv4 299237505 TCP localhost:41175->localhost:ncube-lm (CLOSE_WAIT)
imapsvcd 24498 omu 58u IPv6 299237529 UDP localhost:33311
imapsvcd 24498 omu 59u IPv4 299237531 TCP localhost:41176->localhost:ncube-lm (CLOSE_WAIT)
imapsvcd 24498 omu 60u IPv6 299237553 UDP localhost:33326
imapsvcd 24498 omu 61u IPv4 299237555 TCP localhost:41177->localhost:ncube-lm (CLOSE_WAIT)
imapsvcd 24498 omu 62u IPv6 299237586 UDP localhost:33337
imapsvcd 24498 omu 63u IPv4 299237588 TCP localhost:41179->localhost:ncube-lm (CLOSE_WAIT)
imapsvcd 24498 omu 64u IPv6 299237648 UDP localhost:33355
imapsvcd 24498 omu 65u IPv4 299237650 TCP localhost:41181->localhost:ncube-lm (CLOSE_WAIT)
imapsvcd 24498 omu 66u IPv6 299237674 UDP localhost:33360
imapsvcd 24498 omu 67u IPv4 299237676 TCP localhost:41182->localhost:ncube-lm (CLOSE_WAIT)
imapsvcd 24498 omu 68u IPv6 299237698 UDP localhost:33364
...
Anyone know why these generate?