IPX DDK-1000 - Manual (Page 20)

unique IP, which must be in the same class type as your network address. IP
addresses are written as four sets of numbers separated by periods; for example,
192.168.1.1 Therefore, if the connected network is identified as Class C, for
example, the first three sets of numbers of the Ipxcam IP address must be the
same as the network address. If the connected network is identified as Class B,
the first two sets of numbers of the Ipxcam IP address must be the same as the
network address. If you have any questions regarding these settings, please
consult a qualified MIS professional or your ISP.
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