Robtex

Up: 222.164.48.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 222.164.48.0/23
Down right: 222.164.50.0/23

IP	Type	Hostname
222.164.48.33	PTR	cm33.epsilon48.maxonline.com.sg
222.164.48.207	PTR	cm207.epsilon48.maxonline.com.sg
222.164.50.27	PTR	cm27.epsilon50.maxonline.com.sg
222.164.51.43	PTR	43.51.164.222.starhub.net.sg