Robtex

Up: 81.61.0.0/17
Can't show all results, try to descend to a more specific CIDR
Down left: 81.61.64.0/19
Down right: 81.61.96.0/19

IP	Type	Hostname
81.61.67.238	PTR	81.61.67.238.dyn.user.ono.com
81.61.67.238	A	vprieto.es
81.61.68.30	A	81.61.68.30.dyn.user.ono.com
81.61.69.94	A+PTR	81.61.69.94.dyn.user.ono.com
81.61.72.215	A+PTR	81.61.72.215.dyn.user.ono.com
81.61.84.45	A+PTR	81.61.84.45.dyn.user.ono.com
81.61.84.141	A	81.61.84.141.dyn.user.ono.com
81.61.84.170	PTR	81.61.84.170.dyn.user.ono.com
81.61.84.226	A+PTR	81.61.84.226.dyn.user.ono.com
81.61.86.108	A+PTR	81.61.86.108.dyn.user.ono.com
81.61.86.176	A+PTR	81.61.86.176.dyn.user.ono.com
81.61.86.182	PTR	81.61.86.182.dyn.user.ono.com
81.61.87.120	A+PTR	81.61.87.120.dyn.user.ono.com
81.61.89.14	A+PTR	81.61.89.14.dyn.user.ono.com
81.61.96.30	A+PTR	81.61.96.30.dyn.user.ono.com
81.61.100.18	A+PTR	81.61.100.18.dyn.user.ono.com
81.61.105.105	A+PTR	81.61.105.105.dyn.user.ono.com
81.61.105.124	A+PTR	81.61.105.124.dyn.user.ono.com
81.61.105.124	A	kiwisdr.sytes.net
81.61.106.94	A+PTR	81.61.106.94.dyn.user.ono.com
81.61.111.10	A	81.61.111.10.dyn.user.ono.com
81.61.111.13	A	81.61.111.13.dyn.user.ono.com
81.61.111.14	A	81.61.111.14.dyn.user.ono.com
81.61.111.27	A	81.61.111.27.dyn.user.ono.com
81.61.111.65	A+PTR	81.61.111.65.dyn.user.ono.com
81.61.111.66	A+PTR	81.61.111.66.dyn.user.ono.com
81.61.111.78	A	81.61.111.78.dyn.user.ono.com
81.61.111.86	A	81.61.111.86.dyn.user.ono.com
81.61.111.133	A	81.61.111.133.dyn.user.ono.com
81.61.111.134	A	81.61.111.134.dyn.user.ono.com
81.61.111.135	A	81.61.111.135.dyn.user.ono.com
81.61.111.141	A	81.61.111.141.dyn.user.ono.com
81.61.111.196	A	81.61.111.196.dyn.user.ono.com
81.61.111.198	A	81.61.111.198.dyn.user.ono.com
81.61.111.199	A	81.61.111.199.dyn.user.ono.com
81.61.111.201	A	81.61.111.201.dyn.user.ono.com
81.61.114.211	A+PTR	81.61.114.211.dyn.user.ono.com
81.61.115.0	A+PTR	81.61.115.0.dyn.user.ono.com
81.61.115.3	A+PTR	81.61.115.3.dyn.user.ono.com
81.61.115.8	A	81.61.115.8.dyn.user.ono.com
81.61.115.27	A	81.61.115.27.dyn.user.ono.com
81.61.115.66	A+PTR	81.61.115.66.dyn.user.ono.com
81.61.115.76	A	81.61.115.76.dyn.user.ono.com
81.61.115.77	A	81.61.115.77.dyn.user.ono.com
81.61.115.78	A	81.61.115.78.dyn.user.ono.com
81.61.115.131	A+PTR	81.61.115.131.dyn.user.ono.com
81.61.115.132	A	81.61.115.132.dyn.user.ono.com
81.61.115.133	A	81.61.115.133.dyn.user.ono.com
81.61.115.134	A	81.61.115.134.dyn.user.ono.com
81.61.115.195	A+PTR	81.61.115.195.dyn.user.ono.com
81.61.115.203	A	81.61.115.203.dyn.user.ono.com
81.61.115.204	A	81.61.115.204.dyn.user.ono.com
81.61.115.205	A	81.61.115.205.dyn.user.ono.com
81.61.123.198	A+PTR	81.61.123.198.dyn.user.ono.com