Robtex

Up: 208.202.64.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 208.202.64.0/25
Down right: 208.202.64.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
208.202.64.1	PTR	gateway.btlaw.com
208.202.64.2	PTR	instant01.btlaw.com
208.202.64.3	PTR	mail03.btlaw.com
208.202.64.3	A	mail.healthcarecompliancegroup.com
208.202.64.3	A	mail.nenrseries.com
208.202.64.6	A	mail1.intelpro.com
208.202.64.9	PTR	temp.btlaw.com
208.202.64.99	PTR	border.btlaw.com
208.202.64.100	PTR	ftp.btlaw.com
208.202.64.222	PTR	mail.roemermintz.com
208.202.64.238	PTR	btmail.btlaw.com
208.202.64.250	PTR	www.btlaw.com