port-213.61.188.231.tech.dial.de.colt.net has no NS records.
NS records for this zone are defined at de.colt.net.
NS records for this zone are defined at de.colt.net.
Question and response
Question
dig port-213.61.188.231.tech.dial.de.colt.net. NS
Answer
The response has no answer records.
Authority
de.colt.net. 3600 SOA ns0.de.colt.net. hostmaster.de.colt.net. 2010120210 10800 3600 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0