Robtex

Up: 47.11.0.0/17
Can't show all results, try to descend to a more specific CIDR
Down left: 47.11.0.0/19
Down right: 47.11.32.0/19

IP	Type	Hostname
47.11.0.2	A	h2s0a11n47.user.nortelnetworks.com
47.11.9.0	PTR	h0s9a11n47.user.nortelnetworks.com
47.11.9.2	PTR	h2s9a11n47.user.nortelnetworks.com
47.11.9.30	A	h30s9a11n47.user.nortelnetworks.com
47.11.9.204	A	h204s9a11n47.user.nortelnetworks.com
47.11.28.72	PTR	ns1432.ztomy.com
47.11.62.20	PTR	h20s62a11n47.user.nortelnetworks.com