www.equinix.com.edgekey.net has no NS records.
NS records for this zone are defined at edgekey.net.
NS records for this zone are defined at edgekey.net.
Question and response
Question
dig e13414.b.akamaiedge.net. NS
Answer
The response has no answer records.
Authority
b.akamaiedge.net. 1000 SOA n0b.akamaiedge.net. hostmaster.akamai.com. 1773643685 1000 1000 1000 1800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0