Robtex

Up: 198.47.12.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 198.47.13.0/25
Down right: 198.47.13.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
198.47.13.3	A+PTR	mta01.rmoperations.com
198.47.13.3	A	bounce.clk61.com
198.47.13.3	A	replies.prospershow-info.com
198.47.13.16	A+PTR	mx1.e1.napco-info.com
198.47.13.30	A+PTR	mx1.e1.napcopromo.com
198.47.13.31	A+PTR	mx2.e1.napcopromo.com
198.47.13.70	A+PTR	mx1.e4.emeraldexpoinfo.com
198.47.13.71	A+PTR	mx2.e4.emeraldexpoinfo.com
198.47.13.72	A+PTR	mx1.e5.emeraldexpoinfo.com
198.47.13.73	A+PTR	mx2.e5.emeraldexpoinfo.com
198.47.13.74	A+PTR	mx1.e6.emeraldexpoinfo.com
198.47.13.75	A+PTR	mx2.e6.emeraldexpoinfo.com
198.47.13.77	A+PTR	mx2.e7.emeraldexpoinfo.com
198.47.13.97	A+PTR	mx2.e1.sourcemediainfo.com
198.47.13.98	A+PTR	mx1.e2.sourcemediainfo.com
198.47.13.99	A+PTR	mx2.e2.sourcemediainfo.com
198.47.13.100	A+PTR	mx1.e3.sourcemediainfo.com
198.47.13.101	A+PTR	mx2.e3.sourcemediainfo.com
198.47.13.108	A+PTR	mx1.e2.clk30.com
198.47.13.109	A+PTR	mx2.e2.clk30.com
198.47.13.130	A+PTR	mx1.e2.rbinfo3.com
198.47.13.131	A+PTR	mx2.e2.rbinfo3.com
198.47.13.138	A+PTR	mx1.e2.rbinfo4.com
198.47.13.139	A+PTR	mx2.e2.rbinfo4.com
198.47.13.142	A+PTR	mx1.e2.rbinfo5.com
198.47.13.143	A+PTR	mx2.e2.rbinfo5.com
198.47.13.144	A+PTR	mx2.e1.napco-info.com
198.47.13.146	A+PTR	mx1.e2.clk60.com