 . ,       IP- -
 .     ,  -
,    ,    IP-.    -
  FTP-    ,   -
    .

,    ,  IP-
66.187.232.110,     DNS     
110.232.187.66.in-addr.arpa (. 24.5).

		corn		paJ
			>T^		
			 ne	^ (^r	
						
sobell		(redhat^)		(in-addr)
						
fedora		rhn		C6? G1
			^1	
					
				(187"") (a
					
				(232^) (a
					
				PTR ^"n^

. 24.5.      in-addr. arpa

    DNS    dig   IP-, -
  rhn.redhat.com,   66.187.232.110.  
   dig       IP-  -
 .in-addr.arpa: 110.232.187.66.in-addr.arpa    PTR. -
          -
 : rhn.redhat.com.

$ dig rhn.redhat.com

;; QUESTION SECTION:     ( )
;rhn.redhat.corn.                          IN        A

;; ANSWER SECTION:       ( )
rhn.redhat.com.         93       IN       A         66.187.232.110

$ dig 110.232.187.66.in-addr.arpa PTR

 24. DNS/BIND:      729