weird open port 6609

[md5]

anybdy has an idea what is it?

sh-3.2# nmap -p- 127.0.0.1

Starting Nmap 5.00 ( http://nmap.org ) at 2009-10-14 03:22 EDT
Warning: Unable to open interface vmnet8 -- skipping it.
Warning: Unable to open interface vmnet1 -- skipping it.
Stats: 0:00:10 elapsed; 0 hosts completed (1 up), 1 undergoing SYN Stealth Scan
SYN Stealth Scan Timing: About 2.26% done; ETC: 03:30 (0:07:56 remaining)
Stats: 0:00:10 elapsed; 0 hosts completed (1 up), 1 undergoing SYN Stealth Scan
SYN Stealth Scan Timing: About 2.28% done; ETC: 03:30 (0:07:52 remaining)
Stats: 0:06:13 elapsed; 0 hosts completed (1 up), 1 undergoing SYN Stealth Scan
SYN Stealth Scan Timing: About 56.26% done; ETC: 03:33 (0:04:50 remaining)
Stats: 0:06:13 elapsed; 0 hosts completed (1 up), 1 undergoing SYN Stealth Scan
SYN Stealth Scan Timing: About 56.28% done; ETC: 03:33 (0:04:50 remaining)
Interesting ports on localhost (127.0.0.1):
Not shown: 65533 closed ports
PORT     STATE SERVICE
631/tcp  open  ipp
6609/tcp open  unknown