ALTAI units have a Fixed backdoor IP address which we can use if we do not know the Configured IP address and we do not want to factory default the unit.
The Backdoor/Secondary IP address is in 192.168.99.XXX range, where the last byte of the IP address is the last byte of the Ethernet MAC address of the unit converted to Decimal.
Example:
Device Ethernet MAC address: 00:19:BE:20:03:6E
Factory Default Dynamic Secondary IP Address: 192.168.99.110 (6E (HEX) -> 110 (DEC))
The secondary IP shall use IP address from 192.168.99.5 to 192.168.99.254. The other IP addresses are reserved. If the last byte of the MAC address matches the reserved IP addresses, the supported device shall follow the following MAC to IP address mapping.
| Ethernet MAC address | Reserved Purpose | Replaced MAC byte | Secondary IP address |
| XX:XX:XX:XX:XX:00 | Invalid IP | A0 | 192.168.99.160 |
| XX:XX:XX:XX:XX:01 | For gateway | A1 | 192.168.99.161 |
| XX:XX:XX:XX:XX:02 | For operator computer | A2 | 192.168.99.162 |
| XX:XX:XX:XX:XX:03 | For operator computer | A3 | 192.168.99.163 |
| XX:XX:XX:XX:XX:04 | For operator computer | A4 | 192.168.99.164 |
| XX:XX:XX:XX:XX:FF | Invalid IP | AF | 192.168.99.175 |
Example:
Device Ethernet MAC address: 00:19:BE:20:03:FF
Factory Default Secondary IP Address: 192.168.99.175 (FF (HEX)->AF(HEX)->175 (DEC))
1. You can find many free websites which provide Hexa to Decimal converters. Here is one https://www.rapidtables.com/convert/number/hex-to-decimal.html
2. To find the Ethernet MAC address please look for the label with the barcodes on the unit.
3. Please change you computer/laptop IP address to same subnet which is 192.168.99.XX (How to change Network/IP address on my PC)