Robtex

Up: 213.165.224.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 213.165.224.0/23
Down right: 213.165.226.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
213.165.224.0	PTR	unknown.adsl.nitrex.net
213.165.224.2	PTR	mail.lsaprojects.co.uk
213.165.224.3	PTR	sorbauk.nitrex.net
213.165.224.12	PTR	wilco.nitrex.net
213.165.224.55	PTR	unknown.adsl.nitrex.net
213.165.224.55	A	fallback.mx.dagon-networks.net
213.165.224.55	A	core-uk-2.mail.innwa.net
213.165.224.98	PTR	unknown.adsl.nitrex.net
213.165.224.98	A	mail.temps2go.com
213.165.224.116	PTR	mail.thedocs.net
213.165.225.6	A	aftabsarmad.co.uk
213.165.225.6	A	aftabsarmad.com
213.165.225.88	PTR	transistor.pcserviceselectronics.co.uk
213.165.225.90	PTR	dimen.russel.org.uk
213.165.225.145	A	email.verisent.net
213.165.226.2	PTR	raq1.nitrex.net
213.165.226.3	PTR	virusgate.nitrex.net
213.165.226.4	PTR	raq3.nitrex.net
213.165.226.4	A	stanler.nitrex.net
213.165.226.4	A	raq3mail.nitrex.net
213.165.226.6	PTR	raq1.nitrex.net
213.165.226.7	PTR	cs1.nitrex.net
213.165.226.56	PTR	unknown.nitrex.net
213.165.226.110	PTR	unknown.nitrex.net
213.165.226.237	PTR	unknown.nitrex.net
213.165.227.0	PTR	unknown.nitrex.net
213.165.227.5	PTR	raq5.nitrex.net
213.165.227.5	A	www.ukem.com
213.165.227.5	A	playfer.com
213.165.227.6	PTR	unknown.nitrex.net
213.165.227.10	A	spamtitan6.nitrex.net
213.165.227.15	PTR	unknown.nitrex.net
213.165.227.15	A	detoxiy.com
213.165.227.30	PTR	spamtitan.nitrex.net
213.165.227.31	A	spamtitan2.nitrex.net
213.165.227.31	A	spamtitan.nitrex.net
213.165.227.32	PTR	unknown.nitrex.net
213.165.227.32	A	spamtitan.nitrex.net
213.165.227.32	A	spamtitan3.nitrex.net
213.165.227.99	A	exchange.nitrex.net