Robtex

Up: 157.203.42.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 157.203.42.0/25
Down right: 157.203.42.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
157.203.42.0	PTR	net-042-000.uk.atosorigin.com
157.203.42.9	A+PTR	ldap12.atosorigin.com
157.203.42.21	A+PTR	uranus.uk.atosorigin.com
157.203.42.28	A+PTR	acpns.rail.co.uk
157.203.42.33	A+PTR	mailrelay01.uk.atosorigin.com
157.203.42.35	A+PTR	acprelay1.uk.atosorigin.com
157.203.42.42	A+PTR	usd.uk.atosorigin.com
157.203.42.43	A+PTR	usdknb.uk.atosorigin.com
157.203.42.44	A+PTR	usd-train.uk.atosorigin.com
157.203.42.45	A+PTR	usdknb-train.uk.atosorigin.com
157.203.42.46	A	usdknb-test.uk.atosorigin.com
157.203.42.47	A+PTR	usd-test.uk.atosorigin.com
157.203.42.48	PTR	moportal.leeawright.co.uk
157.203.42.48	A	cbp-ind.com
157.203.42.48	A	www.cbp-ind.com
157.203.42.94	A	naboo.uk.atos.net
157.203.42.94	A	naboo.uk.atosorigin.com
157.203.42.94	A	earth.uk.atos.net
157.203.42.96	A	tickets.nationalexpresseastcoast.com
157.203.42.96	A	gnertickets.co.uk
157.203.42.96	A	www.gnertickets.co.uk
157.203.42.110	A	uksp.uk.atos.net
157.203.42.133	PTR	adces01.english-heritage.org.uk
157.203.42.134	PTR	adces02.english-heritage.org.uk
157.203.42.160	A	delta.uk.atosorigin.com
157.203.42.162	A	emails.nationalexpresseastcoast.com
157.203.42.162	A	nationalexpresseastcoast.com
157.203.42.162	A	gner.com
157.203.42.169	A	www.genius-mobile.co.uk
157.203.42.205	PTR	www.ceridianselfservice.com
157.203.42.207	PTR	www.ceridiansssbeta.com
157.203.42.240	PTR	saturn.uk.atosorigin.com
157.203.42.245	A	ocsp.bacs-ocsp.lloydstsb.co.uk
157.203.42.250	A	transport-direct.co.uk