mail.chartercom.com has no NS records.
NS records for this zone are defined at chartercom.com.
NS records for this zone are defined at chartercom.com.
Question and response
Question
dig mail.chartercom.com. NS
Answer
The response has no answer records.
Authority
chartercom.com. 3600 SOA ns1.charter.com. hostmaster.charter.com. 2025060157 43200 3600 2419200 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0