Robtex

Up: 192.162.48.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 192.162.48.0/23
Down right: 192.162.50.0/23

IP	Type	Hostname
192.162.48.0	PTR	router1-0.rbmgroup.pl
192.162.48.2	PTR	router1-2.rbmgroup.pl
192.162.48.42	PTR	router1-42.rbmgroup.pl
192.162.48.63	PTR	router1-63.rbmgroup.pl
192.162.48.143	PTR	router1-143.rbmgroup.pl
192.162.48.185	PTR	router1-185.rbmgroup.pl
192.162.48.185	A	superbiuro.com
192.162.48.206	PTR	router1-206.rbmgroup.pl
192.162.48.254	PTR	router1-254.rbmgroup.pl
192.162.49.1	PTR	router2-1.rbmgroup.pl
192.162.49.2	PTR	router2-2.rbmgroup.pl
192.162.49.7	PTR	router2-7.rbmgroup.pl
192.162.49.17	PTR	router2-17.rbmgroup.pl
192.162.49.19	PTR	router2-19.rbmgroup.pl
192.162.49.27	PTR	router2-27.rbmgroup.pl
192.162.49.50	PTR	router2-50.rbmgroup.pl
192.162.49.62	PTR	router2-62.rbmgroup.pl
192.162.49.63	PTR	router2-63.rbmgroup.pl
192.162.49.66	PTR	router2-66.rbmgroup.pl
192.162.49.74	PTR	router2-74.rbmgroup.pl
192.162.49.75	PTR	router2-75.rbmgroup.pl
192.162.49.78	PTR	router2-78.rbmgroup.pl
192.162.49.79	PTR	router2-79.rbmgroup.pl
192.162.49.82	PTR	router2-82.rbmgroup.pl
192.162.49.95	PTR	router2-95.rbmgroup.pl
192.162.49.97	PTR	router2-97.rbmgroup.pl
192.162.49.123	PTR	router2-123.rbmgroup.pl
192.162.49.126	PTR	router2-126.rbmgroup.pl
192.162.49.167	PTR	router2-167.rbmgroup.pl
192.162.49.170	PTR	router2-170.rbmgroup.pl
192.162.49.172	PTR	router2-172.rbmgroup.pl
192.162.49.174	PTR	router2-174.rbmgroup.pl
192.162.49.180	PTR	router2-180.rbmgroup.pl
192.162.49.184	PTR	router2-184.rbmgroup.pl
192.162.49.193	PTR	router2-193.rbmgroup.pl
192.162.49.199	PTR	router2-199.rbmgroup.pl
192.162.49.207	PTR	router2-207.rbmgroup.pl
192.162.49.209	PTR	router2-209.rbmgroup.pl
192.162.49.220	PTR	router2-220.rbmgroup.pl
192.162.49.250	PTR	router2-250.rbmgroup.pl
192.162.49.255	PTR	router2-255.rbmgroup.pl
192.162.50.1	PTR	router3-1.rbmgroup.pl
192.162.50.23	PTR	router3-23.rbmgroup.pl
192.162.50.25	PTR	router3-25.rbmgroup.pl
192.162.50.185	PTR	router3-185.rbmgroup.pl
192.162.50.250	PTR	router3-250.rbmgroup.pl
192.162.50.250	A	monrob.pl
192.162.50.250	A	mail.monrob.pl
192.162.51.4	PTR	router4-4.rbmgroup.pl
192.162.51.22	PTR	router4-22.rbmgroup.pl
192.162.51.36	PTR	router4-36.rbmgroup.pl
192.162.51.77	PTR	router4-77.rbmgroup.pl
192.162.51.84	PTR	router4-84.rbmgroup.pl
192.162.51.124	PTR	router4-124.rbmgroup.pl
192.162.51.254	PTR	router4-254.rbmgroup.pl
192.162.51.255	PTR	router4-255.rbmgroup.pl