Robtex

Up: 88.151.42.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 88.151.42.0/25
Down right: 88.151.42.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
88.151.42.32	PTR	32-42-151-88.dyn.dns99.co.uk
88.151.42.66	PTR	66-42-151-88.dyn.dns99.co.uk
88.151.42.131	PTR	131-42-151-88.dyn.dns99.co.uk
88.151.42.131	A	mail.rackpeople.dk
88.151.42.131	A	mail.rackpeople.com
88.151.42.136	PTR	136-42-151-88.dyn.dns99.co.uk
88.151.42.136	A	datacenter.rackpeople.com
88.151.42.163	PTR	163-42.authdns.co.uk
88.151.42.163	A	cubizz.com
88.151.42.163	A	*.cubizz.com
88.151.42.166	PTR	166-42-151-88.dyn.dns99.co.uk
88.151.42.166	A	festivalpacket.dk
88.151.42.166	A	blackboxglobal.net
88.151.42.167	A	mail.bayrol.dk
88.151.42.249	PTR	249-42-151-88.dyn.dns99.co.uk
88.151.42.249	A	mail.st.dk