$ORIGIN lab.r4.pm.
$TTL 3600
@   IN  SOA   knot.lab.r4.pm. admin.r4.pm. (
    2024041800 ; serial number
    12h        ; refresh
    15m        ; update retry
    3w         ; expiry
    2h         ; minimum
)

@               86400 IN NS knot.lab.r4.pm.
knot.lab.r4.pm. 86400 IN A  10.20.0.44