Robtex

Up: 80.75.48.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 80.75.52.0/23
Down right: 80.75.54.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
80.75.52.3	PTR	mk080075052003.as16305.a1.net
80.75.52.3	A	mk080075052003.a1.net
80.75.52.5	PTR	mk080075052005.a1.net
80.75.52.15	A+PTR	mk080075052015.a1.net
80.75.52.26	A	mk080075052026.a1.net
80.75.52.48	PTR	mk080075052048.a1.net
80.75.52.64	PTR	mk080075052064.a1.net
80.75.52.80	PTR	mk080075052080.a1.net
80.75.52.81	PTR	mk080075052081.a1.net
80.75.52.103	PTR	mk080075052103.a1.net
80.75.52.252	A	mk080075052252.a1.net
80.75.52.254	A	mk080075052254.a1.net
80.75.53.8	A	mk080075053008.a1.net
80.75.53.17	PTR	mk080075053017.a1.net
80.75.53.18	A	mk080075053018.a1.net
80.75.53.37	PTR	mk080075053037.a1.net
80.75.53.53	A+PTR	mk080075053053.a1.net
80.75.53.60	PTR	mk080075053060.a1.net
80.75.54.9	PTR	mk080075054009.a1.net
80.75.54.32	A+PTR	mk080075054032.a1.net
80.75.54.45	A	mk080075054045.a1.net
80.75.54.52	A	mk080075054052.a1.net
80.75.54.61	A+PTR	mk080075054061.a1.net
80.75.54.76	A+PTR	mk080075054076.a1.net
80.75.54.91	A	mk080075054091.a1.net
80.75.54.95	PTR	mk080075054095.a1.net
80.75.54.139	A	mk080075054139.a1.net
80.75.55.5	A	mk080075055005.a1.net
80.75.55.6	A+PTR	mk080075055006.a1.net
80.75.55.30	A	mk080075055030.a1.net
80.75.55.85	A+PTR	mk080075055085.as16305.a1.net
80.75.55.85	A	nsbc.a1.net
80.75.55.85	A	mk080075055085.a1.net
80.75.55.107	A	mk080075055107.a1.net
80.75.55.109	PTR	sip.a1.net
80.75.55.136	A+PTR	mk080075055136.as16305.a1.net
80.75.55.136	A	mk080075055136.a1.net
80.75.55.183	A	mk080075055183.a1.net
80.75.55.189	A	mk080075055189.a1.net
80.75.55.192	A	mk080075055192.a1.net
80.75.55.209	PTR	mk080075055209.a1.net
80.75.55.255	PTR	mk080075055255.as16305.a1.net