Robtex

Up: 210.57.104.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 210.57.108.0/23
Down right: 210.57.110.0/23

IP	Type	Hostname
210.57.108.56	PTR	unknown.telstraglobal.net
210.57.108.241	PTR	unknown.telstraglobal.net
210.57.109.114	PTR	unknown.telstraglobal.net
210.57.110.152	PTR	unknown.telstraglobal.net
210.57.110.222	PTR	unknown.telstraglobal.net
210.57.111.172	PTR	unknown.telstraglobal.net
210.57.111.192	PTR	unknown.telstraglobal.net