Robtex

Up: 202.218.56.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 202.218.56.0/23
Down right: 202.218.58.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
202.218.56.2	A+PTR	inetgw.lightwell.co.jp
202.218.56.2	A+PTR	mail.lightwell.co.jp
202.218.56.2	A+PTR	ns.lightwell.co.jp
202.218.56.12	PTR	mx2.lightwell.co.jp
202.218.56.13	A+PTR	mx3.lightwell.co.jp
202.218.56.14	A+PTR	mx4.lightwell.co.jp
202.218.59.61	A+PTR	juniper01.spd.lightwell.co.jp
202.218.59.70	A+PTR	mobileiron.spd.lightwell.co.jp