Robtex

Up: 123.100.100.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 123.100.101.0/25
Down right: 123.100.101.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
123.100.101.0	PTR	123-100-101-0.maxnet.net.nz
123.100.101.1	PTR	123-100-101-1.maxnet.net.nz
123.100.101.2	PTR	123-100-101-2.maxnet.net.nz
123.100.101.3	PTR	123-100-101-3.maxnet.net.nz
123.100.101.8	PTR	123-100-101-8.maxnet.net.nz
123.100.101.10	PTR	123-100-101-10.maxnet.net.nz
123.100.101.13	PTR	123-100-101-13.maxnet.net.nz
123.100.101.16	PTR	123-100-101-16.maxnet.net.nz
123.100.101.18	PTR	123-100-101-18.maxnet.net.nz
123.100.101.24	PTR	123-100-101-24.maxnet.net.nz
123.100.101.27	PTR	123-100-101-27.maxnet.net.nz
123.100.101.31	PTR	123-100-101-31.maxnet.net.nz
123.100.101.34	PTR	123-100-101-34.maxnet.net.nz
123.100.101.46	PTR	123-100-101-46.maxnet.net.nz
123.100.101.49	PTR	123-100-101-49.maxnet.net.nz
123.100.101.51	PTR	123-100-101-51.maxnet.net.nz
123.100.101.53	PTR	123-100-101-53.maxnet.net.nz
123.100.101.54	PTR	123-100-101-54.maxnet.net.nz
123.100.101.58	PTR	123-100-101-58.maxnet.net.nz
123.100.101.59	PTR	123-100-101-59.maxnet.net.nz
123.100.101.60	PTR	123-100-101-60.maxnet.net.nz
123.100.101.65	PTR	123-100-101-65.maxnet.net.nz
123.100.101.66	PTR	123-100-101-66.maxnet.net.nz
123.100.101.71	PTR	123-100-101-71.maxnet.net.nz
123.100.101.78	PTR	123-100-101-78.maxnet.net.nz
123.100.101.93	PTR	123-100-101-93.maxnet.net.nz
123.100.101.94	PTR	123-100-101-94.maxnet.net.nz
123.100.101.99	PTR	123-100-101-99.maxnet.net.nz
123.100.101.102	PTR	123-100-101-102.maxnet.net.nz
123.100.101.110	PTR	smtp.elitefitness.co.nz
123.100.101.113	PTR	123-100-101-113.maxnet.net.nz
123.100.101.113	A	smtp.misservices.co.nz
123.100.101.113	A	smtp.it360.co.nz
123.100.101.114	PTR	123-100-101-114.maxnet.net.nz
123.100.101.115	PTR	123-100-101-115.maxnet.net.nz
123.100.101.118	PTR	123-100-101-118.maxnet.net.nz
123.100.101.119	PTR	123-100-101-119.maxnet.net.nz
123.100.101.131	A	unobtainium.braintrust.co.nz
123.100.101.132	PTR	overlord.braintrust.co.nz
123.100.101.132	A	undersiege.co.nz
123.100.101.132	A	delwynward.co.nz
123.100.101.133	A+PTR	ernie.gamewizz.co.nz
123.100.101.133	A	www.gamewizz.com
123.100.101.137	A	stream.braintrust.co.nz
123.100.101.139	A	lukehollisart.com
123.100.101.139	A	9.net.nz
123.100.101.139	A	facesstudio.co.nz
123.100.101.160	PTR	123-100-101-160.maxnet.net.nz
123.100.101.161	PTR	123-100-101-161.maxnet.net.nz
123.100.101.166	PTR	123-100-101-166.maxnet.net.nz
123.100.101.168	PTR	123-100-101-168.maxnet.net.nz
123.100.101.176	PTR	123-100-101-176.maxnet.net.nz
123.100.101.178	PTR	123-100-101-178.maxnet.net.nz
123.100.101.191	PTR	123-100-101-191.maxnet.net.nz
123.100.101.194	PTR	123-100-101-194.maxnet.net.nz
123.100.101.195	PTR	123-100-101-195.maxnet.net.nz
123.100.101.211	PTR	123-100-101-211.maxnet.net.nz
123.100.101.212	PTR	123-100-101-212.maxnet.net.nz
123.100.101.212	A	insane.net.nz
123.100.101.224	PTR	123-100-101-224.maxnet.net.nz
123.100.101.238	PTR	123-100-101-238.maxnet.net.nz
123.100.101.245	PTR	123-100-101-245.maxnet.net.nz
123.100.101.251	PTR	123-100-101-251.maxnet.net.nz