Robtex

Up: 109.87.44.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 109.87.45.0/25
Down right: 109.87.45.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
109.87.45.0	PTR	0.45.87.109.triolan.net
109.87.45.21	PTR	21.45.87.109.triolan.net
109.87.45.40	PTR	40.45.87.109.triolan.net
109.87.45.57	PTR	57.45.87.109.triolan.net
109.87.45.61	PTR	61.45.87.109.triolan.net
109.87.45.70	PTR	70.45.87.109.triolan.net
109.87.45.72	PTR	72.45.87.109.triolan.net
109.87.45.72	A	mail.egf-penza.ru
109.87.45.72	A	mail.get2pc.ru
109.87.45.181	PTR	181.45.87.109.triolan.net
109.87.45.255	PTR	255.45.87.109.triolan.net