Robtex

Up: 45.90.24.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 45.90.28.0/23
Down right: 45.90.30.0/23

IP	Type	Hostname
45.90.28.0	PTR	dns1.nextdns.io
45.90.28.32	PTR	dns1.nextdns.io
45.90.28.55	PTR	dns1.nextdns.io
45.90.28.88	PTR	dns1.nextdns.io
45.90.28.128	PTR	dns1.nextdns.io
45.90.28.129	PTR	dns1.nextdns.io
45.90.28.169	PTR	dns1.nextdns.io
45.90.28.193	PTR	dns1.nextdns.io
45.90.28.201	PTR	dns1.nextdns.io
45.90.28.204	PTR	dns1.nextdns.io
45.90.28.224	PTR	dns1.nextdns.io
45.90.28.244	PTR	dns1.nextdns.io
45.90.28.246	PTR	dns1.nextdns.io
45.90.30.0	PTR	dns2.nextdns.io
45.90.30.56	PTR	dns2.nextdns.io
45.90.30.129	PTR	dns2.nextdns.io
45.90.30.204	PTR	dns2.nextdns.io
45.90.30.209	PTR	dns2.nextdns.io
45.90.30.224	PTR	dns2.nextdns.io
45.90.30.227	PTR	dns2.nextdns.io