Robtex

Up: 216.21.128.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 216.21.129.0/25
Down right: 216.21.129.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
216.21.129.1	A+PTR	dns1.radiant.net
216.21.129.1	A	mapleleafdiamonds.ca
216.21.129.2	A+PTR	ns6.netpik.com
216.21.129.3	A+PTR	spooler.van.radiant.net
216.21.129.3	A	mail2.infinityholidays.ca
216.21.129.3	A	corpmail.radiant.net
216.21.129.4	A+PTR	ns4.netpik.com
216.21.129.5	A+PTR	netpik.com
216.21.129.22	A+PTR	dns2.van.radiant.net
216.21.129.25	A	kace1.radiant.net
216.21.129.30	A+PTR	ipmon.radiant.net
216.21.129.50	PTR	mx.radiant.net
216.21.129.50	A	pop.savage-family.com
216.21.129.50	A	pop3.bainsnets.com
216.21.129.51	PTR	mx.radiant.net
216.21.129.102	PTR	ciril.radiant.net
216.21.129.105	PTR	216-21-129-105.ip.van.radiant.net
216.21.129.105	A	custompewterandcopper.com
216.21.129.178	A	hsbc.radiant.net
216.21.129.253	A+PTR	216-21-129-253.ip.van.radiant.net