$ORIGIN example.
$TTL 300
@               IN SOA ns.example. mail.example. ( 1 3600 900 604800 300 )
@               IN NS  ns.example.
ns              IN A    192.0.2.254
mx              IN A    192.0.2.253

; Basic: pure ALIAS to a locally-served target.
www             600 IN ALIAS web._ips.example.

; ALIAS plus direct MX on the same node — both must be returnable.
www             300 IN MX    10 mail.example.

; ALIAS to a non-local target; should yield NODATA.
external        300 IN ALIAS web.external.tld.

; Multiple ALIAS rdata on one node; both targets' A records should merge.
multi           300 IN ALIAS web._ips.example.
multi           300 IN ALIAS alt._ips.example.

; Self-referential ALIAS with no A on target — NODATA.
loop            300 IN ALIAS loop.example.

; Self-referential ALIAS with coexisting direct A.
loop2           300 IN ALIAS loop2.example.
loop2           300 IN A     10.0.0.4

; Coexisting ALIAS + direct A; additive.
both            300 IN ALIAS web._ips.example.
both            300 IN A     10.0.0.3

; TTL cap demonstration: alias_ttl=600, target_ttl=300 → synthesised ttl=300.
lowttl          600 IN ALIAS web._ips.example.

; Wildcard ALIAS plus a specific plain-A override.
*.wild1         300 IN ALIAS web._ips.example.
over.wild1      300 IN A     10.0.0.1

; Wildcard plain A plus a specific ALIAS override.
*.wild2         300 IN A     10.0.0.2
login.wild2     300 IN ALIAS web._ips.example.

; Wildcard ALIAS with a specific ALIAS override pointing at a different target.
*.wild3         300 IN ALIAS web._ips.example.
other.wild3     300 IN ALIAS alt._ips.example.

; MX query on an ALIAS node has no effect — only direct MX record
mixmx           300 IN ALIAS mail._ips.example.
mixmx           300 IN MX    20 mx.example.