     DNS     dig 
host ,     .    -
  dig    ,    
  :

$ dig example.corn

;; ANSWER SECTION:          ( )
example.corn.                22198    IN       A        192.0.34.166

   ,   example, corn.    ,
  192.0.34.166. TTL   (    ) -
 22198 ,     6 .    
 ,   dig   -t,     
 ( -t     host):

$ dig -t MX redhat.com

;; ANSWER SECTION:          ( )
redhat.com.        551    IN     MX     20 mx2.redhat.com.
redhat.com.        551    IN     MX     50 mx3.redhat.com.
redhat.com.        551    IN     MX     10 mxl.redhat.com.

    dig   SOA   -
    ,     :

$ dig domaindoesnotexist.info

;; AUTHORITY SECTION:       ( )
info. 7200    IN      SOA         tldl.ultradns.net.domadmin.ultradns.net.

    ,      -
,        .

TSIG.   ,  TSIG (. ),    -
,       .   TSIG
   .      ,
TSIG   .        -
 NTP (. ).

  

IP-,    ,    
 (private address space, . ),    
    ,     DNS.  ,  -
    DNS,     notify  NO.  -
  ,   Internet,  IP-, -
  .      notify.

 24. DNS/BIND:      745