mail3.nicusa.com has no NS records.
NS records for this zone are defined at nicusa.com.
NS records for this zone are defined at nicusa.com.
Question and response
Question
dig mail3.nicusa.com. NS
Answer
The response has no answer records.
Authority
nicusa.com. 1800 SOA glns-1.cdc.nicusa.com. dnsadministrator.egov.com. 2025040801 86400 3600 3600000 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0