When i use 2606:4700:4700::1111 and 1.1.1.1 1.0.0.1
A lookup is working for me. What kind of error are you receiving? And here are some guidelines on testing the resolvers:
$ dig 3u.com
; <<>> DiG 9.10.6 <<>> 3u.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 59147
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1452
;; QUESTION SECTION:
;3u.com. IN A
;; ANSWER SECTION:
3u.com. 600 IN CNAME 3u.com.cdn20.com.
3u.com.cdn20.com. 60 IN A 220.243.212.212
;; Query time: 279 msec
;; SERVER: 1.1.1.1#53(1.1.1.1)
;; WHEN: Sat Oct 27 05:16:59 PDT 2018
;; MSG SIZE rcvd: 78
C:\Users\MSI>nslookup 3u.com
Server: one.one.one.one
Address: 2606:4700:4700::1111Non-authoritative answer:
Name: 3u.com.cdn20.com
Address: 180.180.248.185
Aliases: 3u.com