Robtex

Up: 192.73.212.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 192.73.213.0/25
Down right: 192.73.213.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
192.73.213.1	PTR	d236gsm3728s.ascr.doe.gov
192.73.213.15	PTR	vnc.ascr.doe.gov
192.73.213.38	A	zorkmid.er.doe.gov
192.73.213.49	A+PTR	mail.ascr.doe.gov
192.73.213.49	A	dns2.ascr.doe.gov
192.73.213.49	A	oerhp01.er.doe.gov
192.73.213.73	A+PTR	dns1.ascr.doe.gov
192.73.213.182	PTR	agvideo.ascr.doe.gov