cportal2.visa.com has no NS records.
NS records for this zone are defined at visa.com.
NS records for this zone are defined at visa.com.
Question and response
Question
dig cportal2.visa.com. NS
Answer
The response has no answer records.
Authority
visa.com. 300 SOA lloyd.ns.cloudflare.com. dns.cloudflare.com. 2019111649 10000 2400 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0