blink.server-online.org has no NS records.
NS records for this zone are defined at server-online.org.
NS records for this zone are defined at server-online.org.
Question and response
Question
dig blink.server-online.org. NS
Answer
The response has no answer records.
Authority
server-online.org. 1800 SOA gwen.ns.cloudflare.com. dns.cloudflare.com. 2398510410 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0