This can be handled by Common Login Settings. 

The IPs of all accounts, including subaccounts, can be set in the ""Common Login Allowed IP" field.

When registering multiple IP addresses, set all IP addresses separated by commas.

There is a checkbox for "Allow Adding IPs for each Subaccount".

If unchecked, all sub-accounts will be disabled from logging in from any IP address other than the specified one.

To remove the specified IP address, please leave "Common IPs Allowed to Login" blank and check the "Allow Adding IPs for each Subaccount" checkbox. 


You can access the common login settings in the following two ways. 

Click Account > Account Settings > Change Common Login Settings. 

Click Account > Subaccount > Changed common login settings

How to cancel the specified IP address