Robtex

Up: 101.50.80.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 101.50.84.0/23
Down right: 101.50.86.0/23

IP	Type	Hostname
101.50.84.8	PTR	ntl-50-84-8.nayatel.com
101.50.84.12	PTR	ntl-50-84-12.nayatel.com
101.50.84.14	PTR	ntl-50-84-14.nayatel.com
101.50.84.15	PTR	ntl-50-84-15.nayatel.com
101.50.84.16	PTR	ntl-50-84-16.nayatel.com
101.50.84.32	PTR	ntl-50-84-32.nayatel.com
101.50.84.47	PTR	ntl-50-84-47.nayatel.com
101.50.84.57	PTR	ntl-50-84-57.nayatel.com
101.50.84.58	PTR	ntl-50-84-58.nayatel.com
101.50.84.64	PTR	ntl-50-84-64.nayatel.com
101.50.84.71	PTR	ntl-50-84-71.nayatel.com
101.50.84.77	PTR	ntl-50-84-77.nayatel.com
101.50.84.101	PTR	ntl-50-84-101.nayatel.com
101.50.84.124	PTR	ntl-50-84-124.nayatel.com
101.50.84.136	PTR	ntl-50-84-136.nayatel.com
101.50.84.143	PTR	ntl-50-84-143.nayatel.com
101.50.84.154	PTR	ntl-50-84-154.nayatel.com
101.50.84.174	PTR	ntl-50-84-174.nayatel.com
101.50.84.180	PTR	ntl-50-84-180.nayatel.com
101.50.84.186	PTR	ntl-50-84-186.nayatel.com
101.50.84.214	PTR	ntl-50-84-214.nayatel.com
101.50.84.224	PTR	ntl-50-84-224.nayatel.com
101.50.84.235	PTR	ntl-50-84-235.nayatel.com
101.50.84.245	PTR	ntl-50-84-245.nayatel.com
101.50.85.172	PTR	ntl-50-85-172.nayatel.com
101.50.86.78	PTR	ntl-50-86-78.nayatel.com
101.50.86.154	PTR	ntl-50-86-154.nayatel.com
101.50.87.137	PTR	ntl-50-87-137.nayatel.com