Robtex

Up: 164.128.8.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 164.128.8.0/23
Down right: 164.128.10.0/23

IP	Type	Hostname
164.128.8.2	PTR	i64beb-010-loo1.bb.ip-plus.net
164.128.8.67	A+PTR	isonoe.ip-plus.net
164.128.10.81	PTR	i64beb-001-gig1-1x24.bb.ip-plus.net
164.128.10.93	PTR	i64beb-001-gig1-1x27.bb.ip-plus.net
164.128.10.170	PTR	ipp-sisi-ch-zol-r-001-fas0-1.ce.ip-plus.net
164.128.11.6	PTR	ipp-phai-ch-brn-r-001-fas0-1.ce.ip-plus.net
164.128.11.53	PTR	i64beb-001-gig1-5x22.bb.ip-plus.net
164.128.11.133	PTR	i64beb-001-gig1-5x7.bb.ip-plus.net
164.128.11.182	PTR	prot00-srl0.ip-plus.net