Alcatel Carrier Internetworking Solutions SpeedTouch Speed Touch Home Asymmetric Digital Subscriber Line (ADSL) Modem - Manual (Page 48)

7 Speed Touch Home Local Configuration
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IP address
In this field you can configure a user defined IP address for
the Speed Touch  Home. This IP address will show up as
User" in the 'Routing' web page.
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Netmask / Subnet Mask
For applying subnetting in your local network, fill out a suitable
Subnet Mask.
Below you can find the default Netmasks for the various IP
address classes:
Table 2 IP address Classes and Default Netmasks
IP Address Class Default
Netmask
Example
(Private IP)
A (1.x.x.x to 126.x.x.x) 255.0.0.0 10.x.x.x
B (128.0.x.x to 191.255.x.x) 255.255.0.0 172.16.x.x
C (192.0.0.x to 223.255.255.x) 255.255.255.0 192.168.x.x