anchor.diff:  
   $TTL	604800
   @	IN	SOA	<%= node[:fdqn] %>. root.openstreetmap.org. (
  -                     2019040301		; Serial
  +                     2021092001		; Serial
                            604800		; Refresh
                             86400		; Retry
                           2419200		; Expire
  
positive.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.
  
negative.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.ams.openstreetmap.org.
  101.48.0	IN	PTR	pdu2.ams.openstreetmap.org.
  
  3.49.0		IN	PTR	orm.oob.openstreetmap.org.
  4.49.0		IN	PTR	ouroboros.oob.openstreetmap.org.
  