Robtex

Up: 220.228.64.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 220.228.64.0/22
Down right: 220.228.68.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
220.228.64.12	PTR	adsl-220-228-64-12.nh.sparqnet.net
220.228.67.28	A	adsl-220-228-67-28.nh.sparqnet.net
220.228.68.202	PTR	adsl-220-228-68-202.bc.sparqnet.net
220.228.68.202	A	ctdnsb.c-techone.com
220.228.68.202	A	ctdnsa.c-techone.com