Robtex

Up: 193.124.192.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 193.124.192.0/23
Down right: 193.124.194.0/23

IP	Type	Hostname
193.124.192.0	PTR	0.192.124.193.reverse.teachhosted.com
193.124.192.178	PTR	178.192.124.193.reverse.teachhosted.com
193.124.193.1	PTR	1.193.124.193.reverse.teachhosted.com
193.124.194.70	PTR	70.194.124.193.reverse.teachhosted.com