100.48.0 IN PTR pdu1.ams.openstreetmap.org.
101.48.0 IN PTR pdu2.ams.openstreetmap.org.
102.48.0 IN PTR oob1.ams.openstreetmap.org.
100.48.0 IN PTR pdu1.ams.openstreetmap.org.
101.48.0 IN PTR pdu2.ams.openstreetmap.org.
102.48.0 IN PTR oob1.ams.openstreetmap.org.