Robtex

Up: 204.74.104.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 204.74.104.0/23
Down right: 204.74.106.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
204.74.104.1	A+PTR	rtrpxvn.ultradns.net
204.74.104.2	A	fw1pxvn.ultradns.net
204.74.104.3	A+PTR	loggerpxvn.ultradns.net
204.74.104.4	A+PTR	logc1pxvn.ultradns.net
204.74.104.6	A+PTR	xml2.ultradns.net
204.74.104.7	A	sundb1pxvn.ultradns.net
204.74.104.9	A	ftp1pxvn.ultradns.net
204.74.104.10	A	sndu1pxvn.ultradns.net
204.74.104.12	A	con1pxvn.ultradns.net
204.74.104.20	A	udns2pxvn.ultradns.net
204.74.104.23	A	udns3pxvn.ultradns.net
204.74.104.24	A+PTR	udns4pxvn.ultradns.net
204.74.104.25	A	udns6pxvn.ultradns.net
204.74.104.26	A	udns5pxvn.ultradns.net
204.74.104.27	A	udns7pxvn.ultradns.net
204.74.104.28	A	udns8pxvn.ultradns.net
204.74.104.35	A	mdb1pxvn.ultradns.net
204.74.104.40	A	crs1pxvn.ultradns.net
204.74.104.63	A+PTR	vpn1pxvn.ultradns.net
204.74.104.81	A+PTR	xdns1pxvn.ultradns.net
204.74.104.85	A+PTR	rdns1pxvn.ultradns.net
204.74.104.95	A	web1pxvn.ultradns.net
204.74.104.97	A+PTR	ntp2.ultradns.com
204.74.104.97	PTR	www.ultradns.com
204.74.104.97	A+PTR	www2.ultradns.com
204.74.104.98	PTR	www.ultradns.net
204.74.104.98	PTR	www2.ultradns.net
204.74.104.111	A+PTR	q1pxvn.ultradns.net
204.74.104.112	A	tld1pxvn.ultradns.net
204.74.104.113	A	tld2pxvn.ultradns.net
204.74.104.114	A	tld6pxvn.ultradns.net
204.74.104.115	A+PTR	tld3pxvn.ultradns.net
204.74.104.116	A	tld4pxvn.ultradns.net
204.74.104.117	A	tld5pxvn.ultradns.net
204.74.104.118	A+PTR	tld7pxvn.ultradns.net
204.74.104.119	A+PTR	tld8pxvn.ultradns.net
204.74.104.120	A	q2pxvn.ultradns.net
204.74.104.199	A	udns1pxvn.ultradns.net
204.74.104.254	A	vpnpxvn.ultradns.net
204.74.105.1	A+PTR	rtreqsj.ultradns.net
204.74.105.2	A+PTR	util1eqsj.ultradns.net
204.74.105.2	A	fw1eqsj.ultradns.net
204.74.105.3	A+PTR	rtreqsj-lo0.ultradns.net
204.74.105.4	A+PTR	logc1eqsj.ultradns.net
204.74.105.5	A	udns1eqsj.ultradns.net
204.74.105.6	PTR	bill1eqsj.ultradns.net
204.74.105.7	A+PTR	api1eqsj.ultradns.net
204.74.105.7	A+PTR	logtesteqsj.ultradns.net
204.74.105.8	A+PTR	linuxdbeqsj.ultradns.net
204.74.105.9	A	ftp1eqsj.ultradns.net
204.74.105.10	A	ftp2eqsj.ultradns.net
204.74.105.12	A	con1eqsj.ultradns.net
204.74.105.12	A	mailbacker-old.ultradns.net
204.74.105.14	A	sw1eqsj.ultradns.net
204.74.105.14	A	macdev.ultradns.net
204.74.105.17	A	leafdb3eqsj.ultradns.net
204.74.105.18	A	leafdb4eqsj.ultradns.net
204.74.105.19	A+PTR	bill1eqsj.ultradns.net
204.74.105.20	A	udns2eqsj.ultradns.net
204.74.105.24	A	udns4eqsj.ultradns.net
204.74.105.25	PTR	mxbeqsj.ultradns.net
204.74.105.26	A	udns5eqsj.ultradns.net
204.74.105.27	A	udns6eqsj.ultradns.net
204.74.105.28	A	leafdb5eqsj.ultradns.net
204.74.105.29	A+PTR	leafdb6eqsj.ultradns.net
204.74.105.34	A	sdns2eqsj.ultradns.net
204.74.105.35	A+PTR	feedb1eqsj.ultradns.net
204.74.105.35	PTR	mdb1eqsj.ultradns.net
204.74.105.41	A+PTR	cdb1eqsj.ultradns.net
204.74.105.42	A+PTR	leafdb0eqsj.ultradns.net
204.74.105.43	A+PTR	feedb2eqsj.ultradns.net
204.74.105.61	A	leafdb2eqsj.ultradns.net
204.74.105.62	A	secid1eqsj.ultradns.net
204.74.105.70	A	tldprv1eqsj.ultradns.net
204.74.105.74	A	ldap1eqsj.ultradns.net
204.74.105.81	A+PTR	xdns1eqsj.ultradns.net
204.74.105.85	A	hp1eqsj.ultradns.net
204.74.105.100	A+PTR	repo1eqsj.ultradns.net
204.74.105.103	A	rdns2eqsj.ultradns.net
204.74.105.104	A+PTR	rdns3eqsj.ultradns.net
204.74.105.109	A	logs1eqsj.ultradns.net
204.74.105.110	A+PTR	rpt1eqsj.ultradns.net
204.74.105.111	A	q1eqsj.ultradns.net
204.74.105.112	A	tld1eqsj.ultradns.net
204.74.105.113	A	tld2eqsj.ultradns.net
204.74.105.114	A	tld6eqsj.ultradns.net
204.74.105.115	A+PTR	tld3eqsj.ultradns.net
204.74.105.116	A	tld4eqsj.ultradns.net
204.74.105.117	A	tld5eqsj.ultradns.net
204.74.105.118	A+PTR	tld7eqsj.ultradns.net
204.74.105.119	A	tld8eqsj.ultradns.net
204.74.105.120	A	q2eqsj.ultradns.net
204.74.105.174	A	ldap2eqsj.ultradns.net
204.74.105.200	A+PTR	ntp1eqsj.ultradns.net
204.74.105.221	A	ldap2eqsj.ultradns.net
204.74.105.240	A+PTR	cx1aeqsj.ultradns.net
204.74.105.241	A	cx1beqsj.ultradns.net
204.74.105.242	A	sansw1eqsj.ultradns.net
204.74.105.243	A	sansw2eqsj.ultradns.net
204.74.105.252	A	con2eqsj.ultradns.net
204.74.105.254	A	vpneqsj.ultradns.net
204.74.105.254	A	tms1eqsj.ultradns.net
204.74.106.120	PTR	q2abld.ultradns.net
204.74.106.246	PTR	ntap1abld.ultradns.net