mail.read-books.org has no NS records.
NS records for this zone are defined at read-books.org.
NS records for this zone are defined at read-books.org.
Question and response
Question
dig mail.read-books.org. NS
Answer
The response has no answer records.
Authority
read-books.org. 1800 SOA nf1.no-ip.com. hostmaster.no-ip.com. 2009484605 10800 1800 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0