Robtex

Up: 203.203.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 203.203.20.0/23
Down right: 203.203.22.0/23

IP	Type	Hostname
203.203.21.20	PTR	host-203-203-21-20.dynamic.kbtelecom.net
203.203.21.26	A	host-203-203-21-26.dynamic.kbtelecom.net
203.203.21.50	A	host-203-203-21-50.dynamic.kbtelecom.net
203.203.21.81	A	host-203-203-21-81.dynamic.kbtelecom.net
203.203.21.141	A	host-203-203-21-141.dynamic.kbtelecom.net
203.203.21.143	A+PTR	host-203-203-21-143.dynamic.kbtelecom.net
203.203.21.171	PTR	host-203-203-21-171.dynamic.kbtelecom.net
203.203.21.180	A+PTR	host-203-203-21-180.dynamic.kbtelecom.net
203.203.21.183	A	host-203-203-21-183.dynamic.kbtelecom.net
203.203.21.209	A+PTR	host-203-203-21-209.dynamic.kbtelecom.net
203.203.21.211	PTR	host-203-203-21-211.dynamic.kbtelecom.net