The Registration Limit module prevents new user registrations if the IP address used has recently logged in to another account. It can also be configured to whitelist certain IP addresses to bypass this restriction.
The Registration Limit module limits/blocks registration of new user accounts
when the user's IP address was recently used in former logins to existing
accounts.
This is achieved by saving the timestamp and IP whenever a user logs
in to Drupal.
Whenever a new user wants to register for an account the IP address
of that new user is checked against previous logins, and if a match
is found and is within the configured time limit, the registration
is blocked.
Additionally certain IP Addresses can be whitelisted to circumvent
potential blocks.
Submodules
-
registration_limit_user_api:
Integrates with the User API module
to block registrations via this modules API.