Robtex

Up: 213.206.0.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 213.206.0.0/20
Down right: 213.206.16.0/20

IP	Type	Hostname
213.206.0.0	PTR	no-dns.as5587.net
213.206.0.2	PTR	no-dns.as5587.net
213.206.0.64	PTR	no-dns.as5587.net
213.206.0.128	PTR	no-dns.as5587.net
213.206.0.192	PTR	unallocated.thdo.asphost.net
213.206.0.226	PTR	pressgazette.co.uk
213.206.0.227	PTR	mediaweek.co.uk
213.206.1.0	PTR	no-dns.as5587.net
213.206.1.128	PTR	ws-128.membertek.com
213.206.1.130	PTR	ws-130.membertek.com
213.206.2.0	PTR	no-dns.as5587.net
213.206.2.2	PTR	no-dns.as5587.net
213.206.2.128	PTR	no-dns.as5587.net
213.206.3.0	PTR	no-dns.as5587.net
213.206.3.2	PTR	no-dns.as5587.net
213.206.3.32	PTR	no-dns.as5587.net
213.206.3.64	PTR	no-dns.as5587.net
213.206.3.128	PTR	no-dns.as5587.net
213.206.5.1	A+PTR	0.fa0-4.sw1.f1816.iph.lon.as5587.net
213.206.9.122	A	bumail.mortgagexperience.com
213.206.10.98	PTR	ws98.storm-services.net
213.206.12.211	PTR	no-dns.as5587.net
213.206.15.2	PTR	no-dns.as5587.net
213.206.18.0	PTR	no-dns.as5587.net
213.206.19.0	PTR	no-dns.as5587.net
213.206.19.255	PTR	no-dns.as5587.net
213.206.20.1	PTR	no-dns.as5587.net
213.206.20.3	PTR	no-dns.as5587.net
213.206.20.35	PTR	no-dns.as5587.net
213.206.20.129	PTR	no-dns.as5587.net
213.206.20.226	PTR	no-dns.as5587.net
213.206.21.0	PTR	no-dns.as5587.net
213.206.23.1	PTR	no-dns.as5587.net
213.206.24.2	PTR	no-dns.as5587.net
213.206.26.2	PTR	lon-main-2.high-velocity.ltd.net
213.206.27.129	PTR	p129-b27-surfport-dynamic.dialin.net
213.206.27.224	PTR	p224-b27-surfport-dynamic.dialin.net
213.206.29.255	PTR	no-dns.as5587.net
213.206.30.255	PTR	no-dns.as5587.net
213.206.31.2	PTR	no-dns.as5587.net
213.206.31.255	PTR	no-dns.as5587.net