Robtex

Up: 213.210.48.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 213.210.52.0/23
Down right: 213.210.54.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
213.210.52.73	PTR	gateway1.isba.org.uk
213.210.52.106	PTR	metropolis.shop.graysofwestminster.co.uk
213.210.52.106	A	mail.graysofwestminster.co.uk
213.210.52.107	PTR	gotham.shop.graysofwestmister.co.uk
213.210.53.57	PTR	gateway.taieryri.co.uk
213.210.53.58	PTR	mailgate.taieryri.co.uk
213.210.53.97	PTR	mailgate.muncaster.co.uk
213.210.53.105	PTR	gateway.gazellecorpfin.co.uk
213.210.53.169	PTR	mailgate.silicone-polymers.co.uk
213.210.54.10	PTR	mail.ccee.co.uk
213.210.54.66	A+PTR	gateway01.cook-design.com
213.210.54.67	A	gateway02.cook-design.com
213.210.54.89	PTR	canterbury.dtw.co.uk
213.210.54.105	PTR	mackenziestuart.co.uk
213.210.54.121	A+PTR	mailgate.lansdowne-media.co.uk
213.210.55.3	PTR	exchange.peppers.co.uk
213.210.55.6	PTR	test.peppers.co.uk
213.210.55.11	PTR	mail.birdfood.co.uk
213.210.55.11	A	mail.birdforumshop.com
213.210.55.19	PTR	mail.birdfood.co.uk
213.210.55.21	PTR	dynamic.parkwaycc.co.uk
213.210.55.25	PTR	mailgate.creative-computing.co.uk
213.210.55.42	PTR	mailgate.weightman-bullen.co.uk
213.210.55.49	PTR	bournemouth.ctcaviation.com
213.210.55.58	PTR	mailgate.firedoors.ltd.uk
213.210.55.145	PTR	gateway.cma-ltd.co.uk
213.210.55.169	PTR	mailgate.primaryhealthcareuk.com
213.210.55.171	A	technicalsupportuk.net
213.210.55.171	A	technicalsupportuk.org
213.210.55.171	A	pcdivision.org
213.210.55.177	PTR	mail.1837online.com
213.210.55.177	A	mail.familyresearchlink.com
213.210.55.178	PTR	gateway.snowdoniawindows.co.uk
213.210.55.187	PTR	sm1.uactech.co.uk
213.210.55.189	PTR	cus.uactech.co.uk
213.210.55.225	PTR	mail.mgmnet.co.uk
213.210.55.225	A	mail.mycarbonrevolution.co.uk