Robtex

Up: 41.42.16.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 41.42.16.0/22
Down right: 41.42.20.0/22

IP	Type	Hostname
41.42.16.2	PTR	host-41.42.16.2.tedata.net
41.42.17.177	PTR	host-41.42.17.177.tedata.net
41.42.18.58	PTR	host-41.42.18.58.tedata.net
41.42.18.176	PTR	host-41.42.18.176.tedata.net
41.42.18.179	PTR	host-41.42.18.179.tedata.net
41.42.20.17	PTR	host-41.42.20.17.tedata.net
41.42.20.139	PTR	host-41.42.20.139.tedata.net
41.42.21.0	PTR	host-41.42.21.0.tedata.net
41.42.21.16	PTR	host-41.42.21.16.tedata.net
41.42.21.25	PTR	host-41.42.21.25.tedata.net
41.42.21.43	PTR	host-41.42.21.43.tedata.net
41.42.21.80	PTR	host-41.42.21.80.tedata.net
41.42.21.136	PTR	host-41.42.21.136.tedata.net
41.42.21.138	PTR	host-41.42.21.138.tedata.net
41.42.21.145	PTR	host-41.42.21.145.tedata.net
41.42.21.155	PTR	host-41.42.21.155.tedata.net
41.42.21.169	PTR	host-41.42.21.169.tedata.net
41.42.21.185	PTR	host-41.42.21.185.tedata.net
41.42.21.217	PTR	host-41.42.21.217.tedata.net
41.42.21.219	PTR	host-41.42.21.219.tedata.net
41.42.21.233	PTR	host-41.42.21.233.tedata.net
41.42.21.241	PTR	host-41.42.21.241.tedata.net
41.42.21.250	PTR	host-41.42.21.250.tedata.net
41.42.21.250	A	ns2.egys.net
41.42.21.251	PTR	host-41.42.21.251.tedata.net
41.42.22.136	PTR	host-41.42.22.136.tedata.net
41.42.23.0	PTR	host-41.42.23.0.tedata.net
41.42.23.2	PTR	host-41.42.23.2.tedata.net
41.42.23.35	PTR	host-41.42.23.35.tedata.net
41.42.23.235	PTR	host-41.42.23.235.tedata.net