$TTL 86400 ; 24 hours, could have been written as 24h or 1d
$ORIGIN example.com.

@			7d	IN SOA		ns1.example.com. hostmaster.example.com. (
								2017010101 ; serial
								3H ; refresh
								15 ; retry
								1W ; expire
								5m ; minimum
							)

; name servers
			7D	IN NS		ns1.example.com. ; in the domain
			7D	IN NS		ns2.example.org. ; external to domain

; services and hosts
ns1				IN A		192.168.0.1			; name server IPv4 address
ns1				IN AAAA		2001:0db8::1		; name server IPv6 address
www				IN A		192.168.0.2			; web server
ftp				IN CNAME	www.example.com.	; ftp alias (absolute)
xmpp			IN CNAME	www                 ; xmpp alias (relative)

; mail
				IN MX		10 mail.example.org. ; external mail provider
mail._domainkey	IN TXT		"v=DKIM1\; h=sha256\; k=rsa\; s=email\; p=loooooooooog"

; CAA records for Let's Encrypt, one in RFC 3597 syntax
				IN CAA		0 issue "letsencrypt.org"
; 				IN CAA		0 iodef "mailto:abuse@example.com"
				IN TYPE257	\# 31 0005696F6465666D61696C746F3A6162757365406578616D706C652E636F6D

; xmpp
_jabber._tcp	IN SRV		5 0 5269 xmpp

; special
xx.lcs.mit.edu.	CH A		mit.edu. 2420