Can not access to 3u.com

DNS & Network 1.1.1.1
#1

When i use 2606:4700:4700::1111 and 1.1.1.1 1.0.0.1

#2

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
#3

C:\Users\MSI>nslookup 3u.com
Server: one.one.one.one
Address: 2606:4700:4700::1111

Non-authoritative answer:
Name: 3u.com.cdn20.com
Address: 180.180.248.185
Aliases: 3u.com