Robtex

Up: 213.137.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 213.137.16.0/23
Down right: 213.137.18.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
213.137.16.101	PTR	adsl213.137.16.101.manx.net
213.137.16.131	PTR	adsl213.137.16.131.manx.net
213.137.16.133	PTR	adsl213.137.16.133.manx.net
213.137.16.160	PTR	adsl213.137.16.160.manx.net
213.137.16.162	PTR	adsl213.137.16.162.manx.net
213.137.16.190	PTR	adsl213.137.16.190.manx.net
213.137.17.67	PTR	adsl213.137.17.67.manx.net
213.137.17.132	PTR	adsl213.137.17.132.manx.net
213.137.17.187	PTR	adsl213.137.17.187.manx.net
213.137.17.247	PTR	adsl213.137.17.247.manx.net
213.137.19.5	A	steam-packet.tv
213.137.19.38	PTR	213.137.19.38.synergyit.co.im
213.137.19.40	A+PTR	213.137.19.40.synergyit.co.im
213.137.19.40	A	knoxwealth.com
213.137.19.40	A	mail.claudiaschiffer.com
213.137.19.43	PTR	cj-holding.com
213.137.19.43	PTR	endorconsultants.com
213.137.19.43	PTR	scarus.com
213.137.19.45	A+PTR	213.137.19.45.synergyit.co.im
213.137.19.47	PTR	www.ecogra.org
213.137.19.49	A+PTR	213.137.19.49.synergyit.co.im
213.137.19.50	A+PTR	213.137.19.50.synergyit.co.im
213.137.19.50	A	claudiaschiffer.com
213.137.19.53	PTR	213.137.19.53.synergyit.co.im