Question and response
Question
dig mx.colt.net. PTR
Answer
The response has no answer records.
Authority
mx.colt.net. 300 SOA mc31.lon.server.colt.net. hostmaster.colt.net. 2009100700 1800 1200 3600 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0