Robtex

Up: 5.42.0.0/17
Can't show all results, try to descend to a more specific CIDR
Down left: 5.42.64.0/19
Down right: 5.42.96.0/19

IP	Type	Hostname
5.42.64.0	PTR	ru-kstv-5.42.64-colomna.net
5.42.65.3	PTR	5-42-65-3.colomna.net
5.42.67.2	PTR	5-42-67-2.colomna.net
5.42.67.67	PTR	5-42-67-67.colomna.net
5.42.68.66	PTR	5-42-68-66.colomna.net
5.42.68.67	PTR	5-42-68-67.colomna.net
5.42.69.67	PTR	5-42-69-67.colomna.net
5.42.70.65	PTR	5-42-70-65.colomna.net
5.42.70.193	PTR	5-42-70-193.colomna.net
5.42.70.194	PTR	5-42-70-194.colomna.net
5.42.70.195	PTR	5-42-70-195.colomna.net
5.42.71.66	PTR	5-42-71-66.colomna.net
5.42.71.193	PTR	5-42-71-193.colomna.net
5.42.73.30	A	ns2.offersearch.org
5.42.76.195	PTR	5-42-76-195.colomna.net
5.42.80.3	PTR	5-42-80-3.colomna.net
5.42.87.1	PTR	5-42-87-1.colomna.net
5.42.89.67	PTR	5-42-89-67.colomna.net
5.42.93.194	PTR	5-42-93-194.colomna.net
5.42.99.26	A	devsda.net
5.42.109.131	PTR	5-42-109-131.colomna.net
5.42.111.67	PTR	5-42-111-67.colomna.net
5.42.121.192	PTR	5-42-121-192.colomna.net