mailhost.ic3.com has no NS records.
NS records for this zone are defined at ic3.com.
NS records for this zone are defined at ic3.com.
Question and response
Question
dig mailhost.ic3.com. NS
Answer
The response has no answer records.
Authority
ic3.com. 3600 SOA lloyd.ns.cloudflare.com. dns.cloudflare.com. 2019103222 10000 2400 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0