Robtex

Up: 81.15.168.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 81.15.172.0/23
Down right: 81.15.174.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
81.15.172.6	PTR	host6.zeo.pl
81.15.172.6	A	dns2.zeo.pl
81.15.172.7	A+PTR	mail2.zeo.pl
81.15.172.8	A+PTR	www.zeo.pl
81.15.172.8	A	host218.zeo.pl
81.15.172.66	PTR	mail.asw.waw.pl
81.15.172.66	A	smtp.asw.waw.pl
81.15.172.68	A+PTR	communitylearning.aswarsaw.org
81.15.172.68	A	asw.waw.pl
81.15.172.70	A+PTR	moodle.asw.waw.pl
81.15.172.74	A+PTR	shares.aswarsaw.org
81.15.172.74	A+PTR	shares.asw.waw.pl
81.15.172.74	PTR	zeus.asw.waw.pl
81.15.172.87	A+PTR	smtp.aswarsaw.org
81.15.172.87	A+PTR	smtp.asw.waw.pl
81.15.172.98	A+PTR	system-1.pansa.pl
81.15.172.100	PTR	poczta.pansa.pl
81.15.172.116	A	poczta.itme.edu.pl
81.15.172.135	A	www.sandwich.pl
81.15.172.135	A	grupaatlas.pl
81.15.172.135	A	www.gipsar.pl
81.15.172.136	A+PTR	poczta.atlas.com.pl
81.15.172.137	A	www.programfachowiec.pl
81.15.172.137	A	programfachowiec.pl
81.15.172.138	A	www.dolina-nidy.com.pl
81.15.172.138	A	dolinanidy.com.pl
81.15.172.144	A	www.swiatatlasa.com.pl
81.15.172.144	A	swiatatlasa.com.pl
81.15.172.165	A+PTR	zmta2.atlas.com.pl
81.15.172.174	A	www.technologia-zelowa.pl
81.15.172.174	A	www.technologia-zelowa.com.pl
81.15.172.174	A	technologia-zelowa.pl
81.15.172.184	A	ec1kolejowy.pl
81.15.172.186	A	fox-dekorator.pl
81.15.172.195	A	ftpserver01v.rossmann.com.pl
81.15.172.213	A	jastrzp.rossmann.com.pl
81.15.172.252	A+PTR	dns2.rossmann.com.pl
81.15.173.131	PTR	mpp.modlinairport.pl
81.15.173.194	A+PTR	mail.elb2.pl
81.15.173.194	A	ws.elb2.pl
81.15.173.195	A+PTR	mail2.optimalg.com
81.15.173.195	A	mx2.bestperf.com
81.15.173.196	A+PTR	web.elb2.pl
81.15.173.196	A	www.elb2.pl
81.15.173.196	A	elb2.pl
81.15.173.206	A	mx2.solidhouse.pl
81.15.173.236	A+PTR	mx3.dnb.pl
81.15.173.236	A	mx3.dnbnord.pl