Pasted

$TTL 3H
@	IN SOA	@ dnsmaster.example.com. (
					1806010000	; serial (2018/jun/01, 00:00)
					1D	        ; refresh
					1H	        ; retry
					1W	        ; expire
					3H )	    ; minimum TTL
;
; Nameserver
;
	NS	xulin.example.com.
 ;
; Database
;
100	IN PTR  xulin.example.com.
151	IN PTR	cliente1.example.com.
199	IN PTR  fantasma.example.com.
 ;