blog.efolder.net has no NS records.
NS records for this zone are defined at efolder.net.
NS records for this zone are defined at efolder.net.
Question and response
Question
dig efolder.wpengine.com. NS
Answer
The response has no answer records.
Authority
wpengine.com. 1800 SOA jim.ns.cloudflare.com. dns.cloudflare.com. 2399115088 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0