ws219-255.maryno.net has no NS records.
NS records for this zone are defined at maryno.net.
NS records for this zone are defined at maryno.net.
Question and response
Question
dig ws219-255.maryno.net. NS
Answer
The response has no answer records.
Authority
maryno.net. 86400 SOA ns1.maryno.net. noc.maryno.net. 2015032257 36000 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0