Robtex

Up: 5.28.0.0/17
Can't show all results, try to descend to a more specific CIDR
Down left: 5.28.64.0/19
Down right: 5.28.96.0/19

IP	Type	Hostname
5.28.64.0	PTR	cable-5-28-64-0.cust.telecolumbus.net
5.28.64.2	PTR	cable-5-28-64-2.cust.telecolumbus.net
5.28.65.67	PTR	cable-5-28-65-67.cust.telecolumbus.net
5.28.68.1	PTR	cable-5-28-68-1.cust.telecolumbus.net
5.28.68.128	PTR	cable-5-28-68-128.cust.telecolumbus.net
5.28.68.129	PTR	cable-5-28-68-129.cust.telecolumbus.net
5.28.69.67	PTR	cable-5-28-69-67.cust.telecolumbus.net
5.28.71.25	A	halle.noctec.de
5.28.72.0	PTR	cable-5-28-72-0.cust.telecolumbus.net
5.28.77.24	A	winterkirsche.de
5.28.79.64	A	pushmail.creatives-berlin.com
5.28.80.0	PTR	cable-5-28-80-0.cust.telecolumbus.net
5.28.81.225	A	brainmazing.de
5.28.82.66	PTR	cable-5-28-82-66.cust.telecolumbus.net
5.28.85.67	PTR	cable-5-28-85-67.cust.telecolumbus.net
5.28.88.1	PTR	cable-5-28-88-1.cust.telecolumbus.net
5.28.88.3	PTR	cable-5-28-88-3.cust.telecolumbus.net
5.28.88.197	A	halle.noctec.de
5.28.89.3	PTR	cable-5-28-89-3.cust.telecolumbus.net
5.28.89.131	PTR	cable-5-28-89-131.cust.telecolumbus.net
5.28.94.192	PTR	cable-5-28-94-192.cust.telecolumbus.net
5.28.98.134	A	danielmisch.myds.me
5.28.98.134	A	www.danielmisch.myds.me
5.28.99.66	PTR	cable-5-28-99-66.cust.telecolumbus.net
5.28.100.66	PTR	cable-5-28-100-66.cust.telecolumbus.net
5.28.101.0	PTR	cable-5-28-101-0.cust.telecolumbus.net
5.28.101.131	PTR	cable-5-28-101-131.cust.telecolumbus.net
5.28.102.64	PTR	cable-5-28-102-64.cust.telecolumbus.net
5.28.120.0	PTR	cable-5-28-120-0.cust.telecolumbus.net
5.28.122.219	A	3kbox.de
5.28.125.128	PTR	cable-5-28-125-128.cust.telecolumbus.net
5.28.126.176	A	horcrux.de