Robtex

Up: 204.153.48.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 204.153.48.0/23
Down right: 204.153.50.0/23

IP	Type	Hostname
204.153.48.1	PTR	rtr-border-87-router.princeton.edu
204.153.48.20	A	extern-linknet5.princeton.edu
204.153.48.21	A	border-87-router.princeton.edu
204.153.48.22	A+PTR	border-87-router.princeton.edu
204.153.48.32	A	extern-linknet8.princeton.edu
204.153.48.33	A+PTR	border-87-router.princeton.edu
204.153.48.34	A	esgate.princeton.edu
204.153.48.40	A+PTR	extern-linknet10.princeton.edu
204.153.48.41	A+PTR	border-87-router.princeton.edu
204.153.48.42	A	cs-bgp-mux.princeton.edu
204.153.49.1	A+PTR	core-cdn-router.princeton.edu
204.153.49.2	PTR	kermit-akamainet.princeton.edu
204.153.49.2	A	core-87-router.princeton.edu
204.153.49.5	A	clouseau-akamainet.princeton.edu
204.153.51.0	A	br-extern51-unassigned.princeton.edu