Finding an unknown IP address

Finding an unknown IP address

(devices equipped with CW-4901 Gigabit Ethernet Controller Board)


How can I use a device, if I do not know the IP address my colleague has set it to? Devices  connected  to  IP  network  must  be  equipped  with  individual  IP  address  so  that communication can be made with them separately. Therefore the first step of installation must be setting the IP address conforming to the given system. In case of borrowed devices or devices which are used by several people often happens that the IP address the device was set to last time is not known to us, thus we cannot communicate with it. The IP address can be read out in several ways, we are going to give advices to find the right way.

The simplest case if we know the first 3 bytes of the IP address (e.g. 192.168.1.xx) and the forth one needs to be found only. Using the search function of the SW-4901 software the value of the fourth byte can easily be found.
If we only know the first byte of the IP address, and the further 3 bytes should be found, the search function cannot be used as it would last very long. In this case connect the device to the PC directly so that other devices do not receive the message, and using the CW-4901 Gigabit Ethernet Contoller
software send out in broadcast mode a ‘Replace IP Address’ command. The ‘New IP Address’ can be any optional address. If we know that the device may be set to the 192. ...... range, the command sent to 192.255.255.255 will do the job. The 192.255.255.255 IP address has to be typed in the ‘Write new IP Address here’ box of the SW-4901 software and ‘Enter’ has to be hit. Remarks:  The  ‘Use  CW-Net’  check  box  has  to  be  unchecked.  The  most  frequently  used  IP addresses can be read form the drop-down list, too. The message will only travel out of the PC, if the setting of the network mask is correct. In case of a device at any IP address the solution is sending out the ‘Replace IP Address’ command to the 255.255.255.255 address, but this message will only travel out of most PCs after modifying the network mask.
As ultimate solution we recommend using the hardware key, which resets the original factory settings. For this switch off the device, remove its cover and with the test point marked in section 4.15 of the Manual (Reset Default Jumper - T) connected to the ground (to the other jumper) switch on the device. The place of the jumper is shown in the next figure.