Robtex

Up: 203.21.28.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 203.21.30.0/24
Down right: 203.21.31.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.21.30.97	PTR	r1akl2.wcom.net.nz
203.21.30.110	PTR	manu.ipasifika.net
203.21.30.125	PTR	host02.net.wcom.net.nz
203.21.30.125	A	serta.co.nz
203.21.30.125	A	nznatural.co.nz
203.21.31.218	A	smtp.aon.co.nz