Apex domains cannot have CNAME records.
Question and response
Question
dig savvis.net. NS
Answer
savvis.net. 4 NS ns3.savvis.net.
savvis.net. 4 NS ns6.savvis.net.
savvis.net. 4 NS ns6a.savvis.net.
savvis.net. 4 NS ns2.savvis.net.
savvis.net. 4 NS ns4.savvis.net.
savvis.net. 4 NS ns5.savvis.net.
savvis.net. 4 NS ns1.savvis.net.
Authority
The response has no authority records.
Additional
ns1.savvis.net. 4 A 209.16.211.42
ns2.savvis.net. 4 A 204.194.10.206
ns3.savvis.net. 4 A 209.83.162.35
ns4.savvis.net. 4 A 204.70.49.234
ns5.savvis.net. 4 A 204.71.116.25
ns6.savvis.net. 4 A 212.124.226.230
ns6a.savvis.net. 4 A 212.124.226.231
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0