_ip4netblock.tld-mx.com has no MX records.
Question and response
Question
dig _ip4netblock.tld-mx.com. MX
Answer
The response has no answer records.
Authority
tld-mx.com. 3600 SOA ns1.tld-nscloud.com. support.cloudns.net. 2026021901 7200 1800 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0