Robtex

Up: 101.0.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 101.0.20.0/23
Down right: 101.0.22.0/23

IP	Type	Hostname
101.0.20.2	A+PTR	www2-20.dc-clean.com
101.0.20.19	PTR	ytopgcvfum.19.2345678901.ip
101.0.20.39	A+PTR	www39-20.dcclean.net
101.0.20.64	A	ns1.trthen-actar.info
101.0.20.64	A	ns1.rbedock-grim.info
101.0.20.100	A	www100-20.dc-clean.com
101.0.20.103	A	rbedock-grim.info
101.0.20.128	PTR	www128-20.dc-clean.com
101.0.20.128	A	ns2.trthen-actar.info
101.0.20.128	A	ns2.rbedock-grim.info
101.0.20.153	A	trthen-actar.info
101.0.20.159	A	www159-20.dc-clean.com
101.0.20.167	A+PTR	www167-20.dc-clean.com
101.0.20.183	PTR	www183-20.dc-clean.com
101.0.20.187	A	www187-20.dcclean.net
101.0.20.218	A	www218-20.dc-clean.com
101.0.20.218	A	amgdgwwbem.mjn2k2t27.rbedock-grim.info
101.0.20.246	A	www246-20.dcclean.net
101.0.20.249	A+PTR	www249-20.dc-clean.com
101.0.20.254	A+PTR	www254-20.dc-clean.com
101.0.21.2	PTR	www2-21.dcclean.net
101.0.21.2	A	www2-21.dc-clean.com
101.0.21.9	A+PTR	www9-21.dc-clean.com
101.0.21.18	A+PTR	www18-21.dcclean.net
101.0.21.49	A+PTR	www49-21.dc-clean.com
101.0.21.105	A+PTR	www105-21.dcclean.net
101.0.21.132	A+PTR	www132-21.dc-clean.com
101.0.21.137	A	www137-21.dc-clean.com
101.0.21.158	A	www158-21.dc-clean.com
101.0.21.159	A+PTR	www159-21.dcclean.net
101.0.21.171	A+PTR	www171-21.dc-clean.com
101.0.21.180	A+PTR	www180-21.dc-clean.com
101.0.21.187	PTR	www187-21.dcclean.net
101.0.21.187	A	www187-21.dc-clean.com
101.0.21.206	A+PTR	www206-21.dc-clean.com
101.0.21.211	A+PTR	www211-21.dc-clean.com
101.0.21.223	A+PTR	www223-21.dc-clean.com
101.0.21.230	A+PTR	www230-21.dc-clean.com
101.0.21.233	A+PTR	www233-21.dc-clean.com
101.0.21.236	PTR	www236-21.dcclean.net
101.0.21.252	A+PTR	www252-21.dc-clean.com
101.0.22.2	PTR	www2-22.dcclean.net
101.0.22.2	A	www2-22.dc-clean.com
101.0.22.35	A+PTR	www35-22.dcclean.net
101.0.22.99	A+PTR	www99-22.dc-clean.com
101.0.22.159	A+PTR	www159-22.dc-clean.com
101.0.22.194	A+PTR	www194-22.dcclean.net
101.0.22.197	PTR	www197-22.dcclean.net
101.0.23.32	A+PTR	www32-23.dc-clean.com
101.0.23.47	A+PTR	www47-23.dc-clean.com
101.0.23.52	A+PTR	www52-23.dc-clean.com
101.0.23.76	A+PTR	www76-23.dcclean.net
101.0.23.90	A+PTR	www90-23.dcclean.net
101.0.23.104	PTR	www104-23.dcclean.net
101.0.23.125	A	www125-23.dc-clean.com
101.0.23.140	A+PTR	www140-23.dcclean.net
101.0.23.191	A	www191-23.dc-clean.com
101.0.23.201	A+PTR	www201-23.dcclean.net
101.0.23.208	A+PTR	www208-23.dc-clean.com
101.0.23.215	A+PTR	www215-23.dc-clean.com
101.0.23.227	A+PTR	www227-23.dc-clean.com
101.0.23.229	A+PTR	www229-23.dc-clean.com
101.0.23.239	A+PTR	www239-23.dc-clean.com
101.0.23.245	A+PTR	www245-23.dcclean.net