We recommend using our designated hostname (outgoing.eagle.io) to refer to the current outgoing server addresses if at all possible, as they are not guaranteed to stay the same in the future. 

You can use the nslookup command line tool to resolve this host to the current set of server addresses, for example: 

$nslookup outgoing.eagle.io

Non-authoritative answer:
Name:       outgoing.eagle.io
Addresses:  54.252.235.152
            13.54.238.139
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