SpamTitan Cloud is comprised of four different server clusters, one of which you will be using. The easiest way to determine which cluster you are using is to examine the MX records for your domain. You can check your MX record using MXToolBox.
Your MX records will contain either:
cloud1.spamtitan.com
cloud2.spamtitan.com
OR
cloud3.spamtitan.com
cloud4.spamtitan.com
OR
cloud5.spamtitan.com
cloud6.spamtitan.com
OR
cloud7.spamtitan.com
cloud8.spamtitan.com
The IP address ranges for the different clusters are:
cloud1.spamtitan.com & cloud2.spamtitan.com
- 96.127.141.203
- 198.20.73.147
- 198.20.89.94
cloud3.spamtitan.com & cloud4.spamtitan.com
- 107.6.152.251
- 108.178.61.211
cloud6.spamtitan.com & cloud6.spamtitan.com
- 52.10.98.167
- 52.26.55.167
- 52.32.254.113
cloud7.spamtitan.com & cloud8.spamtitan.com
- 13.58.65.21
- 13.58.8.62
- 52.15.128.102