Siemens SIMATIC NET S7-300 Manual page 136

5 Configuring Communication Connections
Table 5-4
Range used by NCM in which a free port address is
searched for and assigned.
You can set any port address within this range.
Port addresses higher than 5000 are used by the system!
Note:
If you want to use these port addresses, please contact
your system administrator.
The following port numbers are reserved; you should not use these for other
purposes in the connection project engineering.
Table 5-5
Protocol
TCP
TCP
TCP
TCP
TCP
UDP
UDP
UDP
UDP
UDP
UDP
A -136
, Fortsetzung
Application / Note
Reserved Port Numbers
Port Number
20, 21
25
80
102
135
161
34964
65532
65533
65534
65535
FTP
SMTP
HTTP
RFC1006
RPC -DCOM
SNMP_REQUEST
PN IO
NTP
NTP
NTP
NTP
S7-CPs for Industrial Ethernet Configuring and Commissioning
Port Addresses
from 2000 to 5000
from 5000...65535
Service
Release 01/2007
C79000-G8976-C182-07