mail.sirsi.net has no NS records.
NS records for this zone are defined at sirsi.net.
NS records for this zone are defined at sirsi.net.
Question and response
Question
dig mail.sirsi.net. NS
Answer
The response has no answer records.
Authority
sirsi.net. 1800 SOA coco.ns.cloudflare.com. dns.cloudflare.com. 2398699276 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0