Robtex

Up: 204.153.132.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 204.153.134.0/24
Down right: 204.153.135.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
204.153.135.1	A	gateway.acdlabs.com
204.153.135.9	A+PTR	ns.acdlabs.com
204.153.135.10	A+PTR	dns-01.acdlabs.com
204.153.135.11	A+PTR	dns-02.acdlabs.com
204.153.135.17	A	filesrv.acdlabs.com
204.153.135.72	A+PTR	filex.acdlabs.com
204.153.135.73	A	mail.acdlabs.com
204.153.135.78	PTR	wds-srv.acdlabs.com
204.153.135.88	A+PTR	w7-mplienegger.acdlabs.com
204.153.135.137	A	tor-dhcp-137.acdlabs.com
204.153.135.195	A+PTR	www.acdlabs.com
204.153.135.195	A	nmrsoftware.com
204.153.135.195	A	spectrussoftware.ca