$ dig app.example.com

; <<>> DiG 9.8.3-P1 <<>> app.example.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 40373
;; flags: qr rd ra; QUERY: 1, ANSWER: 9, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;app.example.com.    IN  A

;; ANSWER SECTION:
app.example.com. 299 IN  CNAME example.eu-west-1.elasticbeanstalk.com.