I'm trying to get all IP-addresses of a hostname. But dig actually just returns a subset of ips assigned to a host. For example, this hostname e.crashlytics.com is assigned to multiple cnames. Every time I do dig +short e.crashlytics.com, I would get only list of IPs associated with a single cname. How could I get all IPs?
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1 Answer
It's because the DNS servers of AWS ELB return a differrent CNAME to each query of yours with specific policies of its own. Ask AWS for possible CNAMEs and As for your domain they will return.
# host -t ns crashlytics.com crashlytics.com name server ns-279.awsdns-34.com. crashlytics.com name server ns-1609.awsdns-09.co.uk. crashlytics.com name server ns-1226.awsdns-25.org. crashlytics.com name server ns-968.awsdns-57.net. # host -t cname e.crashlytics.com ns-279.awsdns-34.com Using domain server: Name: ns-279.awsdns-34.com Address: 205.251.193.23#53 Aliases: e.crashlytics.com is an alias for events-endpoint-b-1623273513.us-east-1.elb.amazonaws.com. # host -t cname e.crashlytics.com ns-279.awsdns-34.com Using domain server: Name: ns-279.awsdns-34.com Address: 205.251.193.23#53 Aliases: e.crashlytics.com is an alias for events-endpoint-455714294.us-east-1.elb.amazonaws.com. 