Robtex

Up: 79.99.48.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 79.99.48.0/23
Down right: 79.99.50.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
79.99.48.173	PTR	ab79-99-48-173.mxc.ru
79.99.49.72	PTR	ab79-99-49-72.mxc.ru
79.99.49.72	A	mail.rd53.ru
79.99.49.72	A	novtools.ru
79.99.49.146	PTR	ab79-99-49-146.mxc.ru
79.99.49.203	PTR	ab79-99-49-203.mxc.ru
79.99.49.242	PTR	ab79-99-49-242.mxc.ru
79.99.50.142	PTR	ab79-99-50-142.mxc.ru
79.99.50.142	A	mukni.ru
79.99.50.185	PTR	ab79-99-50-185.mxc.ru
79.99.51.59	PTR	ab79-99-51-59.mxc.ru
79.99.51.249	PTR	ab79-99-51-249.mxc.ru