linux.dell.com site is down

sakar@ubuntu:~$ ping linux.dell.com
PING auspllistsapp01.us.dell.com (143.166.156.113) 56(84) bytes of data.
^C
--- auspllistsapp01.us.dell.com ping statistics ---
14 packets transmitted, 0 received, 100% packet loss, time 13351ms

sakar@ubuntu:~$ ping 143.166.156.113
PING 143.166.156.113 (143.166.156.113) 56(84) bytes of data.
^C
--- 143.166.156.113 ping statistics ---
3 packets transmitted, 0 received, 100% packet loss, time 2058ms

sakar@ubuntu:~$ nslookup 143.166.156.113
113.156.166.143.in-addr.arpa    name = lists.us.dell.com.
113.156.166.143.in-addr.arpa    name = auspllistsapp01.us.dell.com.

Authoritative answers can be found from:

sakar@ubuntu:~$ nslookup linux.dell.com
Server:         127.0.0.53
Address:        127.0.0.53#53

Non-authoritative answer:
linux.dell.com  canonical name = auspllistsapp01.us.dell.com.
Name:   auspllistsapp01.us.dell.com
Address: 143.166.156.113

Anyone know about it?