Launch the Network Utility application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ If you’re running Mac OS X 10.7 or later, open LaunchPad. Click Utilities, then Network Utility in the page that opens.
Select the Lookup tab and enter
in the address field. Press return. Post the output – the text, please, not a screenshot.
Select the Ping tab and do the same.
; <<>> DiG 9.6-ESV-R4-P3 <<>> www.facebook.com +multiline +nocomments +nocmd +noquestion +nostats +search
;; global options: +cmd
www.facebook.com. 22768 IN A 18.104.22.168
www.facebook.com. 424 IN NS glb1.facebook.com.
www.facebook.com. 424 IN NS glb2.facebook.com.
glb1.facebook.com. 1080 IN A 22.214.171.124
glb2.facebook.com. 1080 IN A 126.96.36.199
PING www.facebook.com (188.8.131.52): 56 data bytes
Request timeout for icmp_seq 0
Request timeout for icmp_seq 1
Request timeout for icmp_seq 2
Request timeout for icmp_seq 3
Request timeout for icmp_seq 4
Request timeout for icmp_seq 5
Request timeout for icmp_seq 6
Request timeout for icmp_seq 7
Request timeout for icmp_seq 8
--- www.facebook.com ping statistics ---
10 packets transmitted, 0 packets received, 100.0% packet loss
Your DNS server is returning incorrect results, either because it's located in mainland China or because it's been contaminated by false results coming from there.
Select ▹ System Preferences ▹ Network ▹ Advanced ▹ DNS. Under DNS Servers you should have one or more numerical addresses, such as “192.168.1.1” or “10.0.0.1”. What are those addresses?