[dns-operations] why any .fm query reuturns NOERROR

[Peng Yonghua]

$ dig werwfsdfs.fm

; <<>> DiG 9.8.1-P1 <<>> werwfsdfs.fm
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 34599
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;werwfsdfs.fm.			IN	A

;; AUTHORITY SECTION:
fm.			1799	IN	SOA	ns0.centralnic.net. itmanager.fsmtc.fm. 94307 900 300 
604800 3600

;; Query time: 35 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Fri Apr 28 15:42:07 2017
;; MSG SIZE  rcvd: 100


As you see, given a non-exists .fm domain, the response code is: 
NOERROR, rather than NXDOMAIN.

maybe this is due to .fm has a wildcards MX record?



  dig werwfsdfs.fm mx

; <<>> DiG 9.8.1-P1 <<>> werwfsdfs.fm mx
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 40092
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 6, ADDITIONAL: 0

;; QUESTION SECTION:
;werwfsdfs.fm.			IN	MX

;; ANSWER SECTION:
werwfsdfs.fm.		86399	IN	MX	1 mail.h-email.net.

;; AUTHORITY SECTION:
fm.			86399	IN	NS	tld5.ultradns.info.
fm.			86399	IN	NS	tld6.ultradns.co.uk.
fm.			86399	IN	NS	tld4.ultradns.org.
fm.			86399	IN	NS	tld3.ultradns.org.
fm.			86399	IN	NS	tld2.ultradns.net.
fm.			86399	IN	NS	tld1.ultradns.net.

;; Query time: 37 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Fri Apr 28 15:42:18 2017
;; MSG SIZE  rcvd: 224


please help, thanks.