corp.sigecom.com has no NS records.
NS records for this zone are defined at sigecom.com.
NS records for this zone are defined at sigecom.com.
Question and response
Question
dig corp.sigecom.com. NS
Answer
The response has no answer records.
Authority
sigecom.com. 300 SOA master.dns.rcn.net. hostmaster.rcn.com. 2019022505 3600 600 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0