$ dig m.youtube.com

; <<>> DiG 9.10.3-P4-Ubuntu <<>> m.youtube.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 30428
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;m.youtube.com.                 IN      A

;; ANSWER SECTION:
m.youtube.com.          0       IN      CNAME   restrict.youtube.com.
restrict.youtube.com.   0       IN      A       216.239.38.120

;; Query time: 1 msec
;; SERVER: 192.168.1.1#53(192.168.1.1)
;; WHEN: Fri Jan 12 15:30:08 STD 2018
;; MSG SIZE  rcvd: 92