Robtex

Up: 141.0.12.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 141.0.13.0/25
Down right: 141.0.13.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
141.0.13.0	PTR	n26-03-12.opera-mini.net
141.0.13.1	A+PTR	n26-04-01.opera-mini.net
141.0.13.2	A+PTR	n26-04-02.opera-mini.net
141.0.13.4	A+PTR	n26-04-04.opera-mini.net
141.0.13.4	A	s05-03.opera.com
141.0.13.5	A+PTR	n26-04-05.opera-mini.net
141.0.13.5	A	static.geo.myopera.com
141.0.13.5	A	images.my.opera.com
141.0.13.6	A+PTR	n26-04-06.opera-mini.net
141.0.13.8	A+PTR	n26-04-08.opera-mini.net
141.0.13.12	A+PTR	n04-02-08.opera-mini.net
141.0.13.13	A+PTR	n26-05-01.opera-mini.net
141.0.13.16	A+PTR	n26-05-04.opera-mini.net
141.0.13.20	A+PTR	n26-05-08.opera-mini.net
141.0.13.25	A+PTR	n26-06-01.opera-mini.net
141.0.13.26	PTR	s46-12-v01.opera.com
141.0.13.27	PTR	s46-12-v02.opera.com
141.0.13.30	PTR	s50-11-v02.opera.com
141.0.13.31	PTR	s50-11-v03.opera.com
141.0.13.32	PTR	s50-12-v01.opera.com
141.0.13.38	A+PTR	n27-01-02.opera-mini.net
141.0.13.41	A+PTR	n27-01-05.opera-mini.net
141.0.13.43	A+PTR	n27-01-07.opera-mini.net
141.0.13.45	A+PTR	n27-01-09.opera-mini.net
141.0.13.48	A+PTR	n27-01-12.opera-mini.net
141.0.13.50	PTR	us.tvstore.opera.com
141.0.13.51	PTR	db-tvstore-seattle.opera.com
141.0.13.52	A+PTR	n27-02-04.opera-mini.net
141.0.13.52	A	newsmix.jp
141.0.13.55	A	n27-02-07.opera-mini.net
141.0.13.57	A+PTR	n27-02-09.opera-mini.net
141.0.13.58	A+PTR	n27-02-10.opera-mini.net
141.0.13.60	A	n27-02-12.opera-mini.net
141.0.13.62	A+PTR	n27-03-02.opera-mini.net
141.0.13.63	A	n27-03-03.opera-mini.net
141.0.13.70	PTR	n27-03-10.13.0.141.in-addr.arpa
141.0.13.73	A+PTR	n27-04-01.opera-mini.net
141.0.13.74	A+PTR	n27-04-02.opera-mini.net
141.0.13.74	A	youngstarz.tk
141.0.13.77	A+PTR	n27-04-05.opera-mini.net
141.0.13.78	A+PTR	n27-04-06.opera-mini.net
141.0.13.79	A+PTR	n27-04-07.opera-mini.net
141.0.13.84	PTR	n27-04-12.opera-mini.net
141.0.13.85	A+PTR	n27-05-01.opera-mini.net
141.0.13.89	A+PTR	n27-05-05.opera-mini.net
141.0.13.90	A+PTR	n27-05-06.opera-mini.net
141.0.13.100	A+PTR	n27-06-04.opera-mini.net
141.0.13.103	A+PTR	n27-06-07.opera-mini.net
141.0.13.113	A+PTR	n28-01-05.opera-mini.net
141.0.13.115	A+PTR	n28-01-07.opera-mini.net
141.0.13.121	A+PTR	n28-02-01.opera-mini.net
141.0.13.123	A+PTR	n28-02-03.opera-mini.net
141.0.13.126	A+PTR	n28-02-06.opera-mini.net
141.0.13.127	A+PTR	n28-02-07.opera-mini.net
141.0.13.129	A+PTR	n28-02-09.opera-mini.net
141.0.13.138	A+PTR	n28-03-06.opera-mini.net
141.0.13.140	A+PTR	n28-03-08.opera-mini.net
141.0.13.145	A+PTR	n28-04-01.opera-mini.net
141.0.13.151	A+PTR	n28-04-07.opera-mini.net
141.0.13.157	A+PTR	n28-05-01.opera-mini.net
141.0.13.160	A+PTR	n28-05-04.opera-mini.net
141.0.13.162	A+PTR	n28-05-06.opera-mini.net
141.0.13.163	A+PTR	n28-05-07.opera-mini.net
141.0.13.175	A+PTR	n28-06-07.opera-mini.net
141.0.13.176	A+PTR	n28-06-08.opera-mini.net
141.0.13.184	A+PTR	n29-01-04.opera-mini.net
141.0.13.185	A+PTR	n29-01-05.opera-mini.net
141.0.13.186	PTR	n29-01-06.opera-mini.net
141.0.13.188	A	n29-01-08.opera-mini.net
141.0.13.193	A+PTR	n29-02-01.opera-mini.net
141.0.13.198	A+PTR	n29-02-06.opera-mini.net
141.0.13.199	A+PTR	n29-02-07.opera-mini.net
141.0.13.205	A+PTR	n29-03-01.opera-mini.net
141.0.13.208	A+PTR	n29-03-04.opera-mini.net
141.0.13.214	A+PTR	n29-03-10.opera-mini.net
141.0.13.229	A+PTR	n29-05-01.opera-mini.net
141.0.13.237	A+PTR	n29-05-09.opera-mini.net
141.0.13.241	PTR	n29-06-01.opera-mini.net
141.0.13.242	A	n29-06-02.opera-mini.net
141.0.13.245	A	n29-06-05.opera-mini.net
141.0.13.247	A+PTR	n29-06-07.opera-mini.net
141.0.13.252	A+PTR	n29-06-12.opera-mini.net
141.0.13.252	A	thumbnails3-12.opera.com
141.0.13.253	A+PTR	n30-01-01.opera-mini.net
141.0.13.253	A	justforfun.mypen.is
141.0.13.254	A+PTR	n30-01-02.opera-mini.net