Robtex

Up: 85.158.64.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 85.158.64.0/23
Down right: 85.158.66.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
85.158.64.10	PTR	smtp.smarterbusinessbroadband.net
85.158.64.10	A	mail.mhsgarchive.org
85.158.64.10	A	cash-boards.com
85.158.64.12	A	mx3.chess.plc.uk
85.158.66.10	PTR	chessrevolution.net
85.158.66.10	PTR	makeitcheap.net
85.158.66.10	PTR	smarterbusinessbroadband.net
85.158.66.11	PTR	chessrevolution.com
85.158.66.11	PTR	mx1.chessrevolution.com
85.158.66.11	PTR	proxy.smarterbusinessbroadband.net
85.158.66.12	PTR	mx2.chessrevolution.com
85.158.66.12	PTR	mx3.chessrevolution.com
85.158.66.12	PTR	ntp.chessrevolution.com
85.158.67.10	PTR	chessrevolution.net
85.158.67.10	PTR	makeitcheap.net
85.158.67.10	PTR	smarterbusinessbroadband.net
85.158.67.12	PTR	mx2.chessrevolution.com
85.158.67.12	PTR	mx3.chessrevolution.com
85.158.67.12	PTR	ntp.chessrevolution.com