relaync01.optimalblue.com has no NS records.
NS records for this zone are defined at optimalblue.com.
NS records for this zone are defined at optimalblue.com.
Question and response
Question
dig relaync01.optimalblue.com. NS
Answer
The response has no answer records.
Authority
optimalblue.com. 900 SOA ns-1288.awsdns-33.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0