Port 8081 mystery

HI list...

I ran a nmap scan on quite a few machines on my internal subnet and one 
port that appears on all those scans, especially the machines that are 
still running adequately patched but older Windows 2000 workstations, is 
tcp 8081. Though nmap shows this as blackice-icecap port I do not find any 
such application running in task manager neither is this installed.

nestat-a just lists this port as 'Listening' and does not list any 
application name assigned to it, so why is this port there? Who is using 
this? I have ran antivirus scan and spybot checker just to rule out any 
malware possibilities.

Nessus Scan (tis weeks plugin feed) does not show this port listed amongst 
any vulnerability.

Here is the nmap output:

SuSE101:/home/root # nmap -O 192.168.126.245 --osscan-guess
Starting Nmap 4.00 ( http://www.insecure.org/nmap/ ) at 2007-01-23 11:10 GST
Interesting ports on 192.168.126.245:
(The 1667 ports scanned but not shown below are in state: closed)
PORT     STATE SERVICE
135/tcp  open  msrpc
139/tcp  open  netbios-ssn
445/tcp  open  microsoft-ds
2030/tcp open  device2
8081/tcp open  blackice-icecap
Device type: general purpose
Running: Microsoft Windows NT/2K/XP
OS details: Microsoft Windows 2000 SP4 or XP SP1

Nmap finished: 1 IP address (1 host up) scanned in 1.107 seconds