The Data Masking transformation masks an IP address as another IP address by splitting it into four numbers that are separated by a period. The first number is the network. The Data Masking transformation masks the network number within the network range.
The Data Masking transformation masks a Class A IP address as a Class A IP Address and a 10.x.x.x address as a 10.x.x.x address. The Data Masking transformation does not mask the class and private network address. For example, the Data Masking transformation can mask 11.12.23.34 as 75.32.42.52. and 10.23.24.32 as 10.61.74.84.
Note: When you mask many IP addresses, the Data Masking transformation can return nonunique values because it does not mask the class or private network of the IP addresses.