Production & Sandbox
The production and sandbox are spread on two availability zones, so there are outbounds IPs to white-list:
13.36.19.46
15.236.93.108
34.155.33.41
34.163.52.51
Lengow Support and consultant Access
185.61.176.129
Inbound IPs
Inbound IPs are the ones used to reach Lengow. You need to take action about these only if you have to authorize all outbound traffic on your network.
(s(ftp).files.lengow.io: 34.155.27.102
*.lengow.io: 13.36.99.192, 13.39.41.239, 34.163.111.85
*.lengow.net: 15.188.113.212, 13.37.194.104, 34.163.118.90
Tip: Always prefer SFTP to FTP, as it offers increased security and eliminates any need for IP address whitelisting.