Determining Whether Devices Are On The Same Subnet - Extron electronics FOX 4G Matrix 3200 User Manual

Ethernet Connection, cont'd

Determining whether devices are on the same subnet

To determine the subnet, the local device's IP address is compared to the remote
device's IP address (below). Each address's octets are compared or not compared,
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
• If the subnet mask octet contains the value 0, the related octets of the local
If the unmasked octets of the two IP addresses match (indicated by = in the
figure below) (example 1), the two addresses are on the same subnet.
If the two unmasked fields do not match (indicated by ≠ in the figure below)
(example 2 and example 3), the addresses are not on the same subnet.
A-8 FOX 4G Matrix Switchers • Ethernet Connection
device's address and the remote device's IP address are unmasked.
Unmasked octets are compared (indicated by ? in the figure below).
device's and remote device's IP addresses are masked.
Masked octets are not compared (indicated by X in the figure below).
Example 1
Local IP Address: 192.168.254.254
Subnet Mask: 255.255.0.0 (?.?.X.X)
Remote IP Address: 192.168.2.25
Match?: =.=.X.X — Match
(Same subnet)
Example 2 Example 3
192.168.254.254 192.168.254.254
255.255.0.0 (?.?.X.X) 255.255.0.0 (?.?.X.X)
190.190.2.25 192.190.2.25
≠.≠.X.X — No match =.≠.X.X — No match
(Different subnet) (Different subnet)