Robtex

Up: 179.63.96.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 179.63.96.0/23
Down right: 179.63.98.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
179.63.96.1	A+PTR	mx1.altrepl.com
179.63.96.1	A	altrepl.com
179.63.96.1	A	mail.altrepl.com
179.63.96.98	A+PTR	mx98.altrepl.com
179.63.97.1	A+PTR	mx1.suzymuzy.com
179.63.97.1	A	mail.suzymuzy.com
179.63.97.1	A	suzymuzy.com
179.63.97.2	A+PTR	mx2.suzymuzy.com
179.63.97.34	A+PTR	mx34.suzymuzy.com
179.63.97.50	A+PTR	mx50.suzymuzy.com
179.63.97.58	A+PTR	mx58.suzymuzy.com
179.63.97.162	A+PTR	mx162.suzymuzy.com
179.63.98.1	A	shnolgirl.com
179.63.98.1	A	mail.shnolgirl.com
179.63.98.98	A+PTR	mx98.shnolgirl.com
179.63.98.224	A+PTR	mx224.shnolgirl.com
179.63.99.1	A+PTR	mx1.franclycud.com
179.63.99.1	A	mail.franclycud.com
179.63.99.1	A	franclycud.com
179.63.99.78	A+PTR	mx78.franclycud.com