Question and response
Question
dig open-xchange.com. NS
Answer
open-xchange.com. 300 NS dns3.easydns.org.
open-xchange.com. 300 NS dns4.easydns.info.
open-xchange.com. 300 NS dns1.easydns.com.
open-xchange.com. 300 NS dns2.easydns.net.
Authority
The response has no authority records.
Additional
. 0 OPT [{Extended_DNS_Error: PROHIBITED}] ; payload 1232, xrcode 0, version 0, flags 0