mx43.electric.net has no CNAME records.
Question and response
Question
dig mx43.electric.net. NS
Answer
The response has no answer records.
Authority
electric.net. 2676 SOA ns1.electric.net. dns.electric.net. 1323021603 10000 1800 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0