Cannot resolve acq.esunbank.com.tw

Website, Application, Performance DNS & Network
1 
$ dig acq.esunbank.com.tw @1.1.1.1 A

; <<>> DiG 9.10.6 <<>> acq.esunbank.com.tw @1.1.1.1 A
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 44774
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;acq.esunbank.com.tw.		IN	A

;; Query time: 519 msec
;; SERVER: 1.1.1.1#53(1.1.1.1)
;; WHEN: Sun Nov 18 18:45:55 PST 2018
;; MSG SIZE  rcvd: 37

And it works for 8.8.8.8

$ dig acq.esunbank.com.tw @8.8.8.8 A

; <<>> DiG 9.10.6 <<>> acq.esunbank.com.tw @8.8.8.8 A
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 32578
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;acq.esunbank.com.tw.		IN	A

;; ANSWER SECTION:
acq.esunbank.com.tw.	29	IN	A	175.98.148.247

;; Query time: 156 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Sun Nov 18 18:58:39 PST 2018
;; MSG SIZE  rcvd: 64

Not sure why

2

@bornstub Have a look at this post. Can't connect with my bank mobile app with 1.1.1.1 - #4 by cs-cf

3

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