Robtex

Up: 192.139.138.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 192.139.139.0/25
Down right: 192.139.139.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
192.139.139.10	A+PTR	mail.botetourtva.us
192.139.139.10	A	mail.botetourt.org
192.139.139.10	A	mail2.botetourtva.us
192.139.139.16	PTR	192-139-139-16.unassigned.ntelos.net
192.139.139.16	A	botetourthrsftp.us