Robtex

Up: 192.121.42.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 192.121.42.0/25
Down right: 192.121.42.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
192.121.42.5	A+PTR	d01umesdc0001.d01.myatea.net
192.121.42.5	A	ns1.myatea.net
192.121.42.5	A	dns1.norra.se
192.121.42.6	PTR	d01umesdc0002.d01.myatea.net
192.121.42.6	A	d01.myatea.net
192.121.42.6	A	ns2.myatea.net