.</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, for example due to infrastructure changes. In these cases, if the range of the possible
IPs is known, you should specify the range by CIDR blocks. If the range of the possible IPs is not known, service
entries for TCP cannot be used and
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