You can restrict access to your survey from the collector options. If you turn on Password Protection, respondents need to enter a password in order to take the survey. If you turn on IP Restrictions, you can allow or block a list of IP addresses.
If you turn on Password Protection, when respondents click the survey link, they'll be prompted to enter a password in order to access the survey. There isn't a way to create a unique password for each respondent.
To add a password to your survey:
Password Protection isn't available when In-Response Email Capture is turned on. To enable Password Protection, turn off In-Email Response Capture in your collector settings.
To restrict access to your survey based on the IP addresses of your respondents:
IP addresses are represented in dot-decimal notation—four different numbers, each ranging from 0 to 255, separated by decimal points. Each number represents 8 bits (an octet) of the IP address. Here's an example with each of the four octets shown in a different color: 172.16.254.1
You can use an asterisk (*) as a wildcard to allow or block a particular range of IP addresses by octet. Here are some examples:
|Includes IPs that start with the first octet. The second, third, and fourth octets could each be any number from 0 to 255.
|Includes IPs that start with the first two octets. The third and fourth octets could each be any number from 0 to 255.
|Includes IPs that start with the first three octets. The fourth octet could be any number from 0 to 255.
|Includes IPs that start with the first two octets and end with the fourth octet. The third octet could be any number from 0 to 255.
|Includes all IPs that contain the first and third octet. The second and fourth octets could each be any number from 0 to 255. This equivalent to 192.*.2.*, only you don't need to put the last asterisk.