Question and response
Question
dig smtp00.tps.sfr.net. NS
Answer
smtp00.tps.sfr.net. 5 CNAME pftps-smtp00-cbv4-pr.tps.sfr.net.
Authority
tps.sfr.net. 3973 SOA nspriprov.dns.sfr.net. support.dns.sfr.net. 2016122000 10800 3600 1814400 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0