anchor.diff:  
   3.0.0		IN	PTR	ridley.ucl.openstreetmap.org.
   4.0.0		IN	PTR	snap-02.ucl.openstreetmap.org.
  -5.0.0		IN	PTR	norbert.ucl.openstreetmap.org.
   6.0.0		IN	PTR	urmel.ucl.openstreetmap.org.
  -7.0.0		IN	PTR	faffy.ucl.openstreetmap.org.
  -8.0.0		IN	PTR	zark.ucl.openstreetmap.org.
   9.0.0		IN	PTR	eustace.ucl.openstreetmap.org.
   10.0.0		IN	PTR	eddie.ucl.openstreetmap.org.
   11.0.0		IN	PTR	draco.ucl.openstreetmap.org.
   12.0.0		IN	PTR	sarel.ucl.openstreetmap.org.
   13.0.0		IN	PTR	noquiklos.ucl.openstreetmap.org.
  -14.0.0		IN	PTR	errol.ucl.openstreetmap.org.
   15.0.0		IN	PTR	ysera.ucl.openstreetmap.org.
   17.0.0		IN	PTR	clifford.ucl.openstreetmap.org.
   19.0.0		IN	PTR	grindtooth.ucl.openstreetmap.org.
   20.0.0		IN	PTR	pummelzacken.ucl.openstreetmap.org.
  -40.0.0		IN	PTR	tiamat-00.ucl.openstreetmap.org.
  -41.0.0		IN	PTR	tiamat-01.ucl.openstreetmap.org.
  -42.0.0		IN	PTR	tiamat-02.ucl.openstreetmap.org.
  -43.0.0		IN	PTR	tiamat-03.ucl.openstreetmap.org.
  -44.0.0		IN	PTR	tiamat-10.ucl.openstreetmap.org.
  -45.0.0		IN	PTR	tiamat-11.ucl.openstreetmap.org.
  -46.0.0		IN	PTR	tiamat-12.ucl.openstreetmap.org.
  -47.0.0		IN	PTR	tiamat-13.ucl.openstreetmap.org.
  -48.0.0		IN	PTR	tiamat-20.ucl.openstreetmap.org.
  -49.0.0		IN	PTR	tiamat-21.ucl.openstreetmap.org.
  -50.0.0		IN	PTR	tiamat-22.ucl.openstreetmap.org.
  -51.0.0		IN	PTR	tiamat-23.ucl.openstreetmap.org.
   
   3.1.0		IN	PTR	ridley.oob.openstreetmap.org.
   4.1.0		IN	PTR	snap-02.oob.openstreetmap.org.
  -5.1.0		IN	PTR	norbert.oob.openstreetmap.org.
   6.1.0		IN	PTR	urmel.oob.openstreetmap.org.
  -8.1.0		IN	PTR	zark.oob.openstreetmap.org.
   9.1.0		IN	PTR	eustace.oob.openstreetmap.org.
   10.1.0		IN	PTR	eddie.oob.openstreetmap.org.
   11.1.0		IN	PTR	draco.oob.openstreetmap.org.
   12.1.0		IN	PTR	sarel.oob.openstreetmap.org.
   13.1.0		IN	PTR	noquiklos.oob.openstreetmap.org.
  -14.1.0		IN	PTR	errol.oob.openstreetmap.org.
   15.1.0		IN	PTR	ysera.oob.openstreetmap.org.
   17.1.0		IN	PTR	clifford.oob.openstreetmap.org.
   19.1.0		IN	PTR	grindtooth.oob.openstreetmap.org.
   20.1.0		IN	PTR	pummelzacken.oob.openstreetmap.org.
  -40.1.0		IN	PTR	tiamat-00.oob.openstreetmap.org.
  -41.1.0		IN	PTR	tiamat-01.oob.openstreetmap.org.
  -42.1.0		IN	PTR	tiamat-02.oob.openstreetmap.org.
  -43.1.0		IN	PTR	tiamat-03.oob.openstreetmap.org.
  -44.1.0		IN	PTR	tiamat-10.oob.openstreetmap.org.
  -45.1.0		IN	PTR	tiamat-11.oob.openstreetmap.org.
  -46.1.0		IN	PTR	tiamat-12.oob.openstreetmap.org.
  -47.1.0		IN	PTR	tiamat-13.oob.openstreetmap.org.
  -48.1.0		IN	PTR	tiamat-20.oob.openstreetmap.org.
  -49.1.0		IN	PTR	tiamat-21.oob.openstreetmap.org.
  -50.1.0		IN	PTR	tiamat-22.oob.openstreetmap.org.
  -51.1.0		IN	PTR	tiamat-23.oob.openstreetmap.org.
  -
  -2.16.0		IN	PTR	orm.bm.openstreetmap.org.
  -3.16.0		IN	PTR	shenron.bm.openstreetmap.org.
   
   20.32.0		IN	PTR	grisu.bm.openstreetmap.org.
   21.32.0		IN	PTR	spike-04.bm.openstreetmap.org.
   22.32.0		IN	PTR	spike-05.bm.openstreetmap.org.
   40.32.0		IN	PTR	katla.bm.openstreetmap.org.
  -41.32.0		IN	PTR	thorn-04.bm.openstreetmap.org.
  -42.32.0		IN	PTR	thorn-05.bm.openstreetmap.org.
   
   20.33.0		IN	PTR	grisu.oob.openstreetmap.org.
   21.33.0		IN	PTR	spike-04.oob.openstreetmap.org.
   22.33.0		IN	PTR	spike-05.oob.openstreetmap.org.
   40.33.0		IN	PTR	katla.oob.openstreetmap.org.
  -41.33.0		IN	PTR	thorn-04.oob.openstreetmap.org.
  -42.33.0		IN	PTR	thorn-05.oob.openstreetmap.org.
   
  +3.48.0		IN	PTR	faffy.ams.openstreetmap.org.
   9.48.0		IN	PTR	dulcy.ams.openstreetmap.org.
   10.48.0		IN	PTR	ironbelly.ams.openstreetmap.org.
   11.48.0		IN	PTR	spike-06.ams.openstreetmap.org.
  
positive.code: 14.49.0		IN	PTR	tabaluga.oob.openstreetmap.org.
  15.49.0		IN	PTR	odin.oob.openstreetmap.org.
  16.49.0		IN	PTR	lockheed.oob.openstreetmap.org.
  49.49.0		IN	PTR	snap-01.oob.openstreetmap.org.
  50.49.0		IN	PTR	karm.oob.openstreetmap.org.
  52.49.0		IN	PTR	thorn-02.oob.openstreetmap.org.
  
negative.code: 14.48.0		IN	PTR	tabaluga.ams.openstreetmap.org.
  15.48.0		IN	PTR	odin.ams.openstreetmap.org.
  16.48.0		IN	PTR	lockheed.ams.openstreetmap.org.
  17.48.0		IN	PTR	norbert.ams.openstreetmap.org.
  49.48.0		IN	PTR	snap-01.ams.openstreetmap.org.
  50.48.0		IN	PTR	karm.ams.openstreetmap.org.
  52.48.0		IN	PTR	thorn-02.ams.openstreetmap.org.
  