Open ports

From DreamHost

On Dreamhost servers one finds many open ports,

$ nmap example.org
Starting Nmap 4.68 ( http://nmap.org ) at 2008-10-09 07:18 CST
Interesting ports on apache2-adamant.spyro.dreamhost.com (208.113.253.95):
PORT    STATE    SERVICE
21/tcp  open     ftp
22/tcp  open     ssh
25/tcp  open     smtp
80/tcp  open     http

The above services are well known and understood, but

111/tcp filtered rpcbind 
113/tcp open     auth
548/tcp open     afp
587/tcp open     submission
691/tcp open     resvc

perhaps are for a few of the websites on the shared server, thus all websites on the server will appear to have them open too, though not apparently a security risk...