sf2.usqe4d.custdkim.salesforce.com has no NS records.
NS records for this zone are defined at custdkim.salesforce.com.
NS records for this zone are defined at custdkim.salesforce.com.
Question and response
Question
dig sf2.usqe4d.custdkim.salesforce.com. NS
Answer
The response has no answer records.
Authority
custdkim.salesforce.com. 30 SOA mastername.salesforce.com. hostmaster.salesforce.com. 2041055962 1800 900 2592000 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0