ip136-243-206-108.f2hdns.com has no NS records.
NS records for this zone are defined at f2hdns.com.
NS records for this zone are defined at f2hdns.com.
Question and response
Question
dig ip136-243-206-108.f2hdns.com. NS
Answer
The response has no answer records.
Authority
f2hdns.com. 1800 SOA dom.ns.cloudflare.com. dns.cloudflare.com. 2398967048 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0