Robtex

Up: 87.249.152.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 87.249.156.0/23
Down right: 87.249.158.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
87.249.156.1	A	snfree.core.ttnet.cz
87.249.156.10	A+PTR	snfree.core.ttnet.cz
87.249.156.10	A	snfree.net
87.249.156.18	A	snfree.core.ttnet.cz
87.249.156.30	A	mail.bet-sucha.cz
87.249.156.44	PTR	duchacek.20.sdl.core.ttnet.cz
87.249.156.44	A	mail.canissidera.cz
87.249.156.44	A	ns1.canissidera.cz
87.249.156.60	A	pols.cz
87.249.156.62	A	18091.ph.core.ttnet.cz
87.249.156.109	PTR	bpsgroup
87.249.156.237	PTR	horacekmartin.1.sdl.core.ttnet.cz
87.249.156.237	A	4156.ph.core.ttnet.cz
87.249.156.243	PTR	chalupova.20.sdl.core.ttnet.cz
87.249.156.255	PTR	13755.ph.core.ttnet.cz
87.249.157.0	PTR	5402.ph.core.ttnet.cz
87.249.157.30	PTR	atm.20.sdl.core.ttnet.cz
87.249.157.30	A	mail.atm-zemniprace.cz
87.249.157.30	A	mail.atmcz.cz
87.249.157.183	A+PTR	mail.polstrin.cz
87.249.157.186	A	mail.polymed.cz
87.249.157.186	A	gwhk.polymed.cz
87.249.157.189	PTR	husman.1.sdl.core.ttnet.cz
87.249.157.189	A	mail.ddu-hk.cz
87.249.157.191	PTR	mail.tl-ultralight.cz
87.249.157.191	A	mail.tl-ultralight.com
87.249.157.191	A	mail.sportaircraft.cz
87.249.157.255	PTR	peterova.nada.1.sdl.core.ttnet.cz
87.249.158.0	PTR	kunc.zbynek.1.sdl.core.ttnet.cz
87.249.158.25	PTR	olach.marcela.1.sdl.core.ttnet.cz
87.249.158.25	A	16058.ph.core.ttnet.cz
87.249.158.213	PTR	hunesova.sarka.1.sdl.core.ttnet.cz
87.249.158.234	A	remote.sluzby-hk.cz
87.249.158.239	A+PTR	point1.vsestary.cz
87.249.158.255	PTR	skola.probluz.1.sdl.core.ttnet.cz
87.249.159.0	PTR	b0-31-24-2.core.ttnet.cz
87.249.159.31	PTR	b0-255-24-0.core.ttnet.cz
87.249.159.32	PTR	b0-15-25-1.core.ttnet.cz
87.249.159.63	PTR	b0-255-25-0.core.ttnet.cz
87.249.159.64	PTR	b0-31-25-5.core.ttnet.cz