Those clients not affected are on the IPs 126.96.36.199 to 188.8.131.52. To determine your IP address of your booking software, you can use the service https://www.whatsmydns.net/
The maintenance will take place between 00:01 and 06:00 BST, but expected to be completed around 02:00 BST. There will be no risk to data, however there will be total loss of the network, due to machines being powered down and moved.
Should you have any questions or concerns please contact BookingLive. We apologise for any inconvenience and thank you for your understanding.