Getting "received control channel command 'stats'" messages in named.

Issue

• On DNS system, following messages are coming frequently:

 Sep  3 14:30:04 hostname named[353]: received control channel command 'stats'
 Sep  3 14:30:04 hostname named[353]: dumpstats complete
 Sep  3 14:35:04 hostname named[353]: received control channel command 'stats'
 Sep  3 14:35:04 hostname named[353]: dumpstats complete

• System is running fine and not getting any issue. Why above mesages are coming frequently?

• Also system is receiving following messages:

 Sep  3 15:15:02 hostname named[353]: limit responses to xx.xx.xx.0/24 for VERSION.BIND CH TXT  (06bde)
 Sep  3 15:16:02 hostname named[353]: stop limiting responses to xx.xx.xx.0/24 for VERSION.BIND CH TXT  (06bde)