Robtex

Up: 198.147.0.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 198.147.0.0/21
Down right: 198.147.8.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
198.147.0.0	PTR	198147000000.discovery.com
198.147.0.1	PTR	198147000001.discovery.com
198.147.0.2	PTR	198147000002.discovery.com
198.147.0.34	PTR	198147000034.discovery.com
198.147.1.0	PTR	198147001000.discovery.com
198.147.2.0	PTR	198147002000.discovery.com
198.147.2.225	PTR	198147002225.discovery.com
198.147.2.227	PTR	198147002227.discovery.com
198.147.7.235	A	extmailer.discovery.com
198.147.7.236	A	extmailer.discovery.com
198.147.7.243	PTR	198147007243.discovery.com
198.147.7.244	A	extmailer.discovery.com
198.147.8.38	A	str-mx01.discovery.com
198.147.8.42	A	str-mx02.discovery.com
198.147.8.72	A	str-er1-cn01.discovery.com
198.147.8.72	A	str-er1-zf01.discovery.com
198.147.8.74	A	auth.discovery.com
198.147.8.75	A	auth.discovery.com
198.147.8.83	PTR	198147008083.discovery.com
198.147.8.105	A	str-mx07.discovery.com
198.147.8.106	A	str-mx08.discovery.com
198.147.9.23	A	access.discovery.com
198.147.9.26	A	access.discovery.com
198.147.9.146	PTR	198147009146.discovery.com
198.147.10.66	PTR	198147010066.discovery.com
198.147.10.227	PTR	198147010227.discovery.com
198.147.11.9	A	dci-int02.discovery.com
198.147.11.9	A	auth03.ns.discovery.com
198.147.11.9	A	dct-er1-nsi03.discovery.com
198.147.11.20	A	gate01.discovery.com
198.147.11.22	A	mx01.discovery.com
198.147.11.23	A	mx02.discovery.com
198.147.11.38	A	webcast.discovery.com
198.147.11.40	A	protrac.discovery.com
198.147.11.45	A	roughcutprod.discovery.com
198.147.11.61	A	discoveryprogramsales.com
198.147.11.61	A	discovery-program-sales.com
198.147.11.79	A	mdvpn1.discovery.com
198.147.11.82	A	mdvpn2.discovery.com
198.147.11.83	PTR	198147011083.discovery.com
198.147.11.90	A	mdb2bvpn1.discovery.com
198.147.11.91	A	mdb2bvpn2.discovery.com
198.147.11.204	A	inlet.discovery.com
198.147.12.0	PTR	198147012000.discovery.com
198.147.12.36	A	dct-er1-cn01.discovery.com
198.147.12.36	A	dct-er1-zf01.discovery.com
198.147.12.39	A	digitalmediacenter.discovery.com
198.147.12.40	A	digitalmediacenter.discovery.com
198.147.12.46	A	digitalmediacenter.discovery.com
198.147.12.48	A	ftp.discovery.com
198.147.12.56	A	clipmail1.discovery.com
198.147.12.57	A	clipmail2.discovery.com
198.147.12.59	A	auth.discovery.com
198.147.12.59	A	auth.ecdn.discovery.com
198.147.12.60	A	auth.discovery.com
198.147.12.90	A	portico2-dev.discovery.com
198.147.12.91	A	198147012091.discovery.com
198.147.12.173	A	cat.discovery.com
198.147.12.174	A	grs.discovery.com
198.147.12.200	A	mx05.discovery.com
198.147.12.204	A	mx06.discovery.com
198.147.12.212	A	mx07.discovery.com
198.147.12.213	A	mx08.discovery.com
198.147.12.247	A	journyx.discovery.com
198.147.12.248	A	onecard.discovery.com
198.147.13.6	A	discoveryprogramsales.com
198.147.13.6	A	producers.discovery.com
198.147.14.0	PTR	198147014000.discovery.com
198.147.14.2	PTR	198147014002.discovery.com
198.147.14.35	PTR	198147014035.discovery.com
198.147.14.35	A	mx.itg.discovery.com
198.147.14.35	A	itg.discovery.com
198.147.14.36	A	ops-04.itg.discovery.com
198.147.14.37	A	ads-01.itg.discovery.com
198.147.14.49	A	dev-01.itg.discovery.com
198.147.14.100	A	admin01.ns.discovery.com
198.147.14.110	A	itdocs.discovery.com
198.147.14.142	A	extranet.itg.discovery.com
198.147.15.35	PTR	198147015035.discovery.com
198.147.15.49	PTR	198147015049.discovery.com
198.147.15.71	A	laportico.discovery.com
198.147.15.96	PTR	198147015096.discovery.com
198.147.15.114	PTR	198147015114.discovery.com
198.147.15.115	PTR	198147015115.discovery.com
198.147.15.128	PTR	198147015128.discovery.com
198.147.15.129	PTR	198147015129.discovery.com
198.147.15.131	PTR	198147015131.discovery.com