colocation.yotta.com has no NS records.
NS records for this zone are defined at yotta.com.
NS records for this zone are defined at yotta.com.
Question and response
Question
dig e13349904541492a99d2596e30e932da.v1.radwarecloud.net. NS
Answer
The response has no answer records.
Authority
radwarecloud.net. 300 SOA ns-cloud-c1.googledomains.com. cloud-dns-hostmaster.google.com. 9 21600 3600 259200 300
Additional
. 0 OPT ; payload 512, xrcode 0, version 0, flags 0