mailob1.concordfax.com has no NS records.
NS records for this zone are defined at concordfax.com.
NS records for this zone are defined at concordfax.com.
Question and response
Question
dig mailob1.concordfax.com. NS
Answer
The response has no answer records.
Authority
concordfax.com. 600 SOA a1.uberns.com. postmaster.concordfax.com. 2602230001 3600 600 691200 600
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0