e IPs of the hostname must be specified. Each IP
must be specified by a CIDR block.</p><p>Note that all the IPs of an external service are not always known. To enable egress TCP traffic, only the IPs that are
used by the applications must be specified.</p><p>Also note that the IPs of an external service are not always static, for example in the case of
<a href=https://en.wikipedia.org/wiki/Content_delivery_network>CDNs</a>. Sometimes the IPs are static most of the time, but can
be changed from time to time,