The first 2 octets of the ETZ410/510 module's default IP address is always 85.16. The last 2 octets of the default IP address of the ETZ410/510 module is derived from the last 2 numbers of it's MAC address by converting Hexedecimal values to decimal.
For Example:
The module's MAC address is (in HEX): 00 80 F4 01 29 C3
The default IP address (in decimal) would be: 85.16.41.195 ( where 29 Hex = 41 Dec and C3 Hex = 195 decimal )