anchor.diff:  
   $TTL	604800
   @	IN	SOA	<%= node[:fdqn] %>. root.openstreetmap.org. (
  -                     2019040301		; Serial
  +                     2021092001		; Serial
                            604800		; Refresh
                             86400		; Retry
                           2419200		; Expire
  
positive.code: 50.48.0		IN	PTR	karm.ams.openstreetmap.org.
  52.48.0		IN	PTR	thorn-02.ams.openstreetmap.org.
  53.48.0		IN	PTR	thorn-03.ams.openstreetmap.org.
  100.48.0	IN	PTR	pdu1.openstreetmap.org.
  101.48.0	IN	PTR	pdu2.openstreetmap.org.
  
  3.49.0		IN	PTR	orm.oob.openstreetmap.org.
  4.49.0		IN	PTR	ouroboros.oob.openstreetmap.org.
  
negative.code: 50.49.0		IN	PTR	karm.oob.openstreetmap.org.
  52.49.0		IN	PTR	thorn-02.oob.openstreetmap.org.
  53.49.0		IN	PTR	thorn-03.oob.openstreetmap.org.
  
  2.64.0		IN	PTR	fafnir.dub.openstreetmap.org.
  3.64.0		IN	PTR	spike-01.dub.openstreetmap.org.
  4.64.0		IN	PTR	spike-02.dub.openstreetmap.org.
  5.64.0		IN	PTR	spike-03.dub.openstreetmap.org.
  6.64.0		IN	PTR	idris.dub.openstreetmap.org.
  7.64.0		IN	PTR	konqi.dub.openstreetmap.org.
  8.64.0		IN	PTR	naga.dub.openstreetmap.org.
  9.64.0		IN	PTR	culebre.dub.openstreetmap.org.
  50.64.0		IN	PTR	snap-03.dub.openstreetmap.org.
  100.64.0	IN	PTR	pdu1.dub.openstreetmap.org.
  101.64.0	IN	PTR	pdu2.dub.openstreetmap.org.
  102.64.0	IN	PTR	oob.dub.openstreetmap.org.
  
  2.65.0		IN	PTR	fafnir.oob.openstreetmap.org.
  3.65.0		IN	PTR	spike-01.oob.openstreetmap.org.
  4.65.0		IN	PTR	spike-02.oob.openstreetmap.org.
  5.65.0		IN	PTR	spike-03.oob.openstreetmap.org.
  6.65.0		IN	PTR	idris.oob.openstreetmap.org.
  7.65.0		IN	PTR	konqi.oob.openstreetmap.org.
  8.65.0		IN	PTR	naga.oob.openstreetmap.org.
  9.65.0		IN	PTR	culebre.oob.openstreetmap.org.
  50.65.0		IN	PTR	snap-03.oob.openstreetmap.org.
  