Robtex

Up: 194.121.48.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 194.121.52.0/23
Down right: 194.121.54.0/23

IP	Type	Hostname
194.121.53.65	PTR	194-121-53-65.de.kpn-eurorings.net
194.121.53.201	PTR	194-121-53-201.de.kpn-eurorings.net
194.121.54.48	PTR	194-121-54-48.de.kpn-eurorings.net
194.121.54.109	PTR	194-121-54-109.de.kpn-eurorings.net
194.121.55.34	PTR	194-121-55-34.de.kpn-eurorings.net
194.121.55.54	PTR	194-121-55-54.de.kpn-eurorings.net
194.121.55.99	PTR	194-121-55-99.de.kpn-eurorings.net
194.121.55.164	PTR	194-121-55-164.de.kpn-eurorings.net
194.121.55.187	PTR	194-121-55-187.de.kpn-eurorings.net
194.121.55.198	PTR	194-121-55-198.de.kpn-eurorings.net