Robtex

Up: 109.123.198.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 109.123.199.0/25
Down right: 109.123.199.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
109.123.199.0	PTR	casablanca-net.casablanca.cz
109.123.199.1	A+PTR	protos.casablanca.cz
109.123.199.1	A	bigblueone.biz
109.123.199.1	A	sntcloud.cz
109.123.199.8	A+PTR	online.bigblueone.cz
109.123.199.8	A	bigblueone.cz
109.123.199.8	A	www.bigblueone.cz
109.123.199.9	A+PTR	online.bigblueone.com
109.123.199.9	A	www.bigblueone.com
109.123.199.9	A	bigblueone.com
109.123.199.13	PTR	protos.casablanca.cz
109.123.199.13	A	bigblueone.es
109.123.199.13	A	cloud4health.biz
109.123.199.255	PTR	assigned-109-123-199-255.casablanca.cz