Extron electronics DXP 44 HD 4K PLUS - Page 118

DXP HD 4K PLUS Series • Reference Information 110
Determining whether devices are on the same subnet
To determine the subnet, the local device IP address is compared to the remote device IP
address (see figure 71). The octets of each address are compared or not, depending on the
value in the related subnet mask octet.
• If a subnet mask octet contains the value 255, the related octets of the local device
address and the remote device IP address are unmasked.
Unmasked octets are compared (indicated by ? in figure 71).
• If the subnet mask octet contains the value 0, the related octets of the local device and
remote device IP addresses are masked.
Masked octets are not compared (indicated by n in figure 71).
If the unmasked octets of the two IP addresses match (indicated by = in example 1 of
figure 71), the two addresses are on the same subnet.
If the two unmasked fields do not match (indicated by an unequal sign in figure 71,
examples 2 and 3), the addresses are not on the same subnet.
192.168.254.254
255.255.0.0 (?.?.X.X)
192.168.2.25
= . = .X.X — Match
(Same subnet) (Different subnet) (Different subnet)
Local IP Address:
Subnet Mask:
Remote IP Address:
Match?:
Example 1 Example 2
192.168.254.254
255.255.0.0 (?.?.X.X)
190.190.2.25
≠ . ≠ .X.X — No match
Example 3
192.168.254.254
255.255.0.0 (?.?.X.X)
192.190.2.25
= . ≠ .X.X —
No match
Figure 71. Comparing the IP Addresses
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