Robtex

Up: 203.57.38.0/24
Can't show all results, try to descend to a more specific CIDR
Down left: 203.57.38.0/26
Down right: 203.57.38.64/26
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.57.38.1	A+PTR	dns1.amtac.net
203.57.38.10	A+PTR	amtac.net
203.57.38.10	PTR	amtac.com.au
203.57.38.10	PTR	exchange.amtac.net
203.57.38.11	A	exchange.amtac.net
203.57.38.20	PTR	dev.cpted-2005.com
203.57.38.20	A+PTR	ssldev.amtac.net
203.57.38.20	A+PTR	uploads.amtac.net
203.57.38.21	PTR	email.treasuryreserve.com
203.57.38.21	A+PTR	email.schoolcare.net
203.57.38.21	PTR	webmail.schoolcare.net
203.57.38.22	A+PTR	downloads.ismcpi.org
203.57.38.25	A+PTR	protect.amtac.net
203.57.38.30	PTR	devchat.schoolcare.net
203.57.38.30	PTR	dev.qps.amtac.net
203.57.38.32	A+PTR	webmail.amtac.net
203.57.38.40	A+PTR	mail.treasuryreserve.com
203.57.38.40	A+PTR	mail.amtac.net
203.57.38.40	A+PTR	mail.security.treasuryreserve.com
203.57.38.50	A	securityequipmentcatalog.net
203.57.38.50	A	parachat.amtac.net
203.57.38.50	A	www.securityequipmentcatalogue.net
203.57.38.51	PTR	extract.treasuryreserve.com
203.57.38.51	PTR	id.treasuryreserve.com
203.57.38.51	PTR	security.treasuryreserve.com
203.57.38.52	A+PTR	cctv.amtac.net
203.57.38.53	A+PTR	demo.amtac.net
203.57.38.55	A+PTR	dftupdate.amtac.net
203.57.38.56	A+PTR	dhs.vicoffices.com
203.57.38.65	A+PTR	upload.amtac.net
203.57.38.80	PTR	cpted-2004.com
203.57.38.80	PTR	cptedtraining.com
203.57.38.80	PTR	crime-prevention-through-environmental-design.com
203.57.38.85	PTR	cpted-2005.com
203.57.38.85	A+PTR	old.treasuryreserve.com
203.57.38.85	A+PTR	web1.amtac.net
203.57.38.90	A+PTR	ssl.amtac.net
203.57.38.90	A+PTR	ssl2.amtac.net
203.57.38.90	A+PTR	tsweb.amtac.net
203.57.38.91	A+PTR	chartfx.amtac.net
203.57.38.91	A+PTR	riskwatch.amtac.net
203.57.38.104	A+PTR	tsrad2.amtac.net
203.57.38.105	A+PTR	tsws1.amtac.ca
203.57.38.105	A+PTR	tscaws1.amtac.net
203.57.38.107	A+PTR	tsdirect.amtac.net