Robtex

Up: 12.19.54.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 12.19.55.0/25
Down right: 12.19.55.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
12.19.55.6	A+PTR	st0.aurumtechnology.net
12.19.55.7	PTR	secure0.internet-ebanking.com
12.19.55.8	PTR	aurumtechnology.net
12.19.55.8	PTR	internet-ebanking.net
12.19.55.8	A+PTR	mx.aurumtechnology.net
12.19.55.19	PTR	mizrahi.com
12.19.55.23	PTR	middlesexbank.com
12.19.55.24	PTR	northview.com
12.19.55.27	PTR	cn-bank.com
12.19.55.28	PTR	tsbot.com
12.19.55.29	PTR	lincourtwines.com
12.19.55.33	PTR	mnbonline.net
12.19.55.60	A	secure1.internet-estatements.com
12.19.55.62	PTR	centerbank.com
12.19.55.64	PTR	redwoodcapitalbank.com
12.19.55.66	PTR	cornerstonebank.net
12.19.55.69	PTR	stlandrybank.com
12.19.55.70	A+PTR	fidelityifs.com
12.19.55.71	A+PTR	mail.dewittsb.com
12.19.55.71	A	mail.fidelityifs-email.com
12.19.55.81	PTR	dcbecu.com
12.19.55.88	PTR	lmfcu.net
12.19.55.98	PTR	stpaulsparishfcu.com
12.19.55.104	PTR	dctfcu.com
12.19.55.107	PTR	fvab.com
12.19.55.110	PTR	firstchoicebankca.com
12.19.55.111	PTR	aircofcu.com
12.19.55.112	PTR	cflsb.com
12.19.55.112	A	mailserver1.internet-estatements.com
12.19.55.133	PTR	pbbla.com
12.19.55.134	A	swtfcu.com
12.19.55.138	PTR	libertyfirst.us
12.19.55.141	PTR	bksalem.net
12.19.55.142	PTR	concordiabank.com
12.19.55.144	PTR	americanafinancial.com
12.19.55.152	PTR	norcalbank.com
12.19.55.153	PTR	cbfx.com
12.19.55.155	PTR	inbound.fidelityifs-email.com
12.19.55.155	PTR	mail.lnbrockwall.com
12.19.55.155	PTR	mail.owencom.com
12.19.55.156	PTR	lnbrockwall.com
12.19.55.157	PTR	bankofokolona.com
12.19.55.160	PTR	ccbca.com
12.19.55.168	A	lawyersescrow.net
12.19.55.172	PTR	capitalmark.com
12.19.55.173	PTR	fnbrotan.com
12.19.55.174	PTR	americancontinentalbank.com
12.19.55.175	A+PTR	secure4.internet-estatements.com
12.19.55.178	PTR	rivercitybankonline.com
12.19.55.179	PTR	cnbtexas.com
12.19.55.181	PTR	centrebank.net
12.19.55.190	PTR	ccbanc.com
12.19.55.204	A	mailserver2.internet-estatements.com
12.19.55.205	PTR	cardinalbank.com
12.19.55.206	PTR	fnbbarron.com
12.19.55.211	PTR	unionsla.com
12.19.55.212	A	mail2.fidelityifs-email.com
12.19.55.216	A	mail.eatonfederal.com
12.19.55.216	A	eatonfederal.com
12.19.55.216	A	eatonfederal.net
12.19.55.221	A+PTR	webvault.vaultguard.com
12.19.55.221	A+PTR	webvault.vaultguard.com.aurumtechnology.net
12.19.55.226	A+PTR	ev.vaultguard.com
12.19.55.229	A	secure2.internet-estatements.com
12.19.55.233	PTR	fsbfm.com
12.19.55.237	PTR	pennlibertybank.com
12.19.55.240	A	internet-estatements.com
12.19.55.242	PTR	foxchasebank.com
12.19.55.243	PTR	firstbanklake.com
12.19.55.249	PTR	arundelfederal.com
12.19.55.252	PTR	grantsvillefcu.com
12.19.55.253	PTR	ns2.aurumtechnology.net
12.19.55.254	PTR	ns0.aurumtechnology.net