Robtex

Up: 172.255.138.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 172.255.138.0/25
Down right: 172.255.138.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
172.255.138.57	A	ns2.corprailroad.com
172.255.138.58	A	vpn00238.corprailroad.com
172.255.138.58	A	vpn00209.corprailroad.com
172.255.138.58	A	vpn00226.corprailroad.com
172.255.138.161	A	ns1.corpprank.com
172.255.138.162	A	ns2.corpprank.com
172.255.138.163	A	techniquesquirquin.corpprank.com
172.255.138.163	A	hornspeak.corpprank.com
172.255.138.163	A	corpprank.com