graph.sentris.com has no NS records.
NS records for this zone are defined at sentris.com.
NS records for this zone are defined at sentris.com.
Question and response
Question
dig graph.sentris.com. NS
Answer
The response has no answer records.
Authority
sentris.com. 14400 SOA ns100.sentris.com. hostmaster.sentris.com. 2020062913 14400 3600 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0