Robtex

Up: 213.16.52.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 213.16.52.0/25
Down right: 213.16.52.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
213.16.52.64	PTR	213-16-52-64.ip.btc-net.bg
213.16.52.66	PTR	66_52.btc-net.bg
213.16.52.71	PTR	213-16-52-71.ip.btc-net.bg
213.16.52.90	PTR	beautyzone.bg
213.16.52.90	PTR	douglasbeauty.bg
213.16.52.90	PTR	mail.douglasbeauty.bg
213.16.52.91	PTR	91_52.btc-net.bg
213.16.52.91	A	ns2.nicotianabt.com
213.16.52.97	A+PTR	213-16-52-97.ip.btc-net.bg
213.16.52.129	PTR	pazar.securities.bg
213.16.52.133	PTR	darklord.securities.bg
213.16.52.135	PTR	lora.securities.bg
213.16.52.144	PTR	botyo.securities.bg
213.16.52.152	PTR	boyan.securities.bg
213.16.52.173	PTR	manuela.securities.bg
213.16.52.181	PTR	vasil.securities.bg
213.16.52.212	PTR	212_52.btc-net.bg
213.16.52.212	A	ns.seability.bg
213.16.52.213	A+PTR	mail.bonmar.net
213.16.52.216	PTR	216_52.btc-net.bg
213.16.52.216	A	mail.bsa-bulgaria.com
213.16.52.216	A	bsa-bulgaria.com
213.16.52.217	PTR	hotspot.bonmarine.com
213.16.52.217	A	ns2.bonmar.bg
213.16.52.233	A+PTR	213-16-52-233.ip.btc-net.bg