Robtex

Up: 84.51.48.0/24
Can't show all results, try to descend to a more specific CIDR
Down left: 84.51.48.128/26
Down right: 84.51.48.192/26
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
84.51.48.130	PTR	host-84-51-48-130.teletektelekom.com
84.51.48.138	PTR	mail.ercangroup.com
84.51.48.138	PTR	mail.thecolourshotels.com
84.51.48.138	A+PTR	posta.ercangroup.com
84.51.48.146	PTR	host-84-51-48-146.teletektelekom.com
84.51.48.186	PTR	host-84-51-48-186.teletektelekom.com