Robtex

Up: 18.20.0.0/15
Can't show all results, try to descend to a more specific CIDR
Down left: 18.21.0.0/17
Down right: 18.21.128.0/17

IP	Type	Hostname
18.21.0.72	A+PTR	av-extron-2-147.mit.edu
18.21.0.74	A+PTR	x8host.mit.edu
18.21.0.79	A	canach.mit.edu
18.21.0.146	A	barbarian.mit.edu
18.21.1.1	A+PTR	printer2-084.mit.edu
18.21.1.2	A+PTR	takase.mit.edu
18.21.1.3	A+PTR	chemed04.mit.edu
18.21.1.4	A+PTR	macha.mit.edu
18.21.156.235	A	nitaro.de
18.21.169.149	A	originalablir.ooo
18.21.199.79	A	about-carlos.com