Robtex

Up: 213.137.28.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 213.137.30.0/24
Down right: 213.137.31.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
213.137.30.24	PTR	host213.137.30.24.manx.net
213.137.30.44	PTR	host213.137.30.44.manx.net
213.137.30.113	PTR	host213.137.30.113.manx.net
213.137.30.115	PTR	host213.137.30.115.manx.net
213.137.30.123	PTR	host213.137.30.123.manx.net
213.137.30.150	PTR	host213.137.30.150.manx.net
213.137.30.158	PTR	host213.137.30.158.manx.net
213.137.30.161	PTR	host213.137.30.161.manx.net
213.137.30.210	PTR	host213.137.30.210.manx.net
213.137.30.231	PTR	host213.137.30.231.manx.net
213.137.30.232	PTR	host213.137.30.232.manx.net
213.137.30.236	PTR	host213.137.30.236.manx.net
213.137.31.12	A+PTR	outbound.manx.net
213.137.31.21	A+PTR	ns1.manx.net
213.137.31.22	A	ns3.manx.net
213.137.31.33	A+PTR	ssch.manx.net
213.137.31.58	A+PTR	broadband.manx.net
213.137.31.58	A	t11test.manx.net
213.137.31.58	A	srp.manx-telecom.com
213.137.31.78	PTR	pwp.manx.net
213.137.31.78	A	insomniak.net
213.137.31.78	A	pwpmyadmin.manx.net