@jarens Nowadays for some reason that IP whitelist become a thing, maybe somebody use it in a Networking course or something, but in plain English is wrong is an old practice no longer in use in the cloud envirotment...
They would be/should be totally fine whitelisting netsuite domain because:
1- Is a trusted domain.
2- SFTP is based on SSH protocol which have a very decent security/one of the best security...