eld of the entry, a block of IPs in <a href=https://tools.ietf.org/html/rfc2317>CIDR</a>
notation must be used. Note that the <code>hosts</code> field is ignored for TCP service entries.</p><p>To enable TCP traffic to an external service by its hostname, all the 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