Robtex

Up: 103.13.168.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 103.13.172.0/23
Down right: 103.13.174.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
103.13.172.21	PTR	zz10313172021.userreserved.kddi.net.sg
103.13.172.21	A	onlimits.net
103.13.172.21	A	ns2.heartrise.co.jp
103.13.172.73	A	yamahaproductregistration.com
103.13.173.4	PTR	zz10313173004.userreserved.kddi.net.sg
103.13.173.22	PTR	zz10313173022.userreserved.kddi.net.sg
103.13.173.25	PTR	zz10313173025.userreserved.kddi.net.sg
103.13.173.38	PTR	zz10313173038.userreserved.kddi.net.sg
103.13.173.70	PTR	zz10313173070.userreserved.kddi.net.sg
103.13.173.92	PTR	zz10313173092.userreserved.kddi.net.sg
103.13.173.124	A+PTR	zz10313173124.userreserved.kddi.net.sg
103.13.173.171	A+PTR	zz10313173171.userreserved.kddi.net.sg
103.13.173.194	A+PTR	zz10313173194.userreserved.kddi.net.sg
103.13.173.236	A+PTR	zz10313173236.userreserved.kddi.net.sg
103.13.175.13	PTR	zz10313175013.userreserved.kddi.net.sg
103.13.175.14	PTR	zz10313175014.userreserved.kddi.net.sg
103.13.175.46	PTR	zz10313175046.userreserved.kddi.net.sg
103.13.175.60	PTR	zz10313175060.userreserved.kddi.net.sg
103.13.175.63	PTR	zz10313175063.userreserved.kddi.net.sg
103.13.175.103	A+PTR	zz10313175103.userreserved.kddi.net.sg
103.13.175.139	A+PTR	zz10313175139.userreserved.kddi.net.sg
103.13.175.145	A	www.t-gems.net
103.13.175.149	PTR	zz10313175149.userreserved.kddi.net.sg
103.13.175.151	A+PTR	zz10313175151.userreserved.kddi.net.sg
103.13.175.203	A+PTR	zz10313175203.userreserved.kddi.net.sg
103.13.175.207	A+PTR	zz10313175207.userreserved.kddi.net.sg
103.13.175.218	A+PTR	zz10313175218.userreserved.kddi.net.sg