Robtex

Up: 41.42.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 41.42.20.0/23
Down right: 41.42.22.0/23

IP	Type	Hostname
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
41.42.21.28	PTR	host-41.42.21.28.tedata.net
41.42.21.29	PTR	host-41.42.21.29.tedata.net
41.42.21.31	PTR	host-41.42.21.31.tedata.net
41.42.21.43	PTR	host-41.42.21.43.tedata.net
41.42.21.54	PTR	host-41.42.21.54.tedata.net
41.42.21.80	PTR	host-41.42.21.80.tedata.net
41.42.21.93	PTR	host-41.42.21.93.tedata.net
41.42.21.109	PTR	host-41.42.21.109.tedata.net
41.42.21.127	PTR	host-41.42.21.127.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
41.42.21.159	PTR	host-41.42.21.159.tedata.net
41.42.21.166	PTR	host-41.42.21.166.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
41.42.21.229	PTR	host-41.42.21.229.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
41.42.22.4	PTR	host-41.42.22.4.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
41.42.23.204	PTR	host-41.42.23.204.tedata.net
41.42.23.235	PTR	host-41.42.23.235.tedata.net