Robtex

Up: 81.21.0.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 81.21.16.0/21
Down right: 81.21.24.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
81.21.16.18	A	mail.severntrent.com
81.21.16.22	A+PTR	sc.lucomp.net
81.21.16.22	A	res_time11292.ppp.twt.it
81.21.16.22	A	ns-c.lucomp.net
81.21.16.33	PTR	res-bit17126.ppp.twt.it
81.21.16.33	PTR	res-biesd43091d.ppp.twt.it
81.21.16.33	A	res_biesd43091d.ppp.twt.it
81.21.16.54	A+PTR	res_tele13537.ppp.twt.it
81.21.16.54	A+PTR	res_vox19584v.ppp.twt.it
81.21.16.97	A	attilio.eu
81.21.16.118	A+PTR	res_gt15560.ppp.twt.it
81.21.16.118	A+PTR	res_synk41514d.ppp.twt.it
81.21.16.174	A+PTR	res_paci13292.ppp.twt.it
81.21.16.174	A+PTR	res_phx19646.ppp.twt.it
81.21.16.174	A+PTR	res_sit31341d.ppp.twt.it
81.21.16.181	A+PTR	res_anet11290.ppp.twt.it
81.21.16.181	A	mail.cassaedilepavia.it
81.21.16.181	A	cassaedilepavia.it
81.21.16.183	A	nds231.ddns.net
81.21.16.207	A	res_vtel54804d.ppp.twt.it
81.21.16.207	A	res_nald10982.ppp.twt.it
81.21.16.207	A	res_fona16897.ppp.twt.it
81.21.17.174	A	mail.gianniferrari.com
81.21.18.66	A	mail.demac.it
81.21.18.118	A	top3.it
81.21.18.245	A+PTR	mail.studio-mulas.it
81.21.18.246	A	ts.studio-mulas.it
81.21.18.254	A	mx20.toscanosas.com
81.21.19.29	A	newsbit.ruredil.it
81.21.19.51	A+PTR	mail.ginex.it
81.21.19.163	A	mail.studioarchimede.eu
81.21.19.163	A	mail.labormagister.it
81.21.19.163	A	studiotecniconavale.eu
81.21.19.165	PTR	reverse.overange.com
81.21.19.167	PTR	reverse.overange.com
81.21.20.3	A+PTR	res_plus12028.ppp.twt.it
81.21.20.3	A+PTR	res_tce27502d.ppp.twt.it
81.21.20.15	A	res_aton11967.ppp.twt.it
81.21.20.22	A	res_sit11860.ppp.twt.it
81.21.20.22	A	res_fon54262d.ppp.twt.it
81.21.20.40	A	res_txnt12566v.ppp.twt.it
81.21.20.43	A	res-aton11738.ppp.twt.it
81.21.20.43	A	res_aton11738.ppp.twt.it
81.21.20.50	A+PTR	res_site12451.ppp.twt.it
81.21.20.50	A+PTR	res_biesd40595v.ppp.twt.it
81.21.20.62	A	res_phx32358d.ppp.twt.it
81.21.20.62	A	res_2knt12354d.ppp.twt.it
81.21.20.73	A	res_mill12432.ppp.twt.it
81.21.20.73	A	res_netsec41233d.ppp.twt.it
81.21.20.76	A	res-area36166d.ppp.twt.it
81.21.20.76	A	res-snc57652d.ppp.twt.it
81.21.20.83	A+PTR	res_ante12606.ppp.twt.it
81.21.20.83	A+PTR	res_area41290d.ppp.twt.it
81.21.20.86	A	res_aton11790.ppp.twt.it
81.21.20.99	PTR	res_time12605.ppp.twt.it
81.21.20.103	A	res_mill12623.ppp.twt.it
81.21.20.103	A	res_ncmd25619d.ppp.twt.it
81.21.20.131	A+PTR	res_airi32619d.ppp.twt.it
81.21.20.136	A	res_glob11891.ppp.twt.it
81.21.20.148	A	res_nald20759.ppp.twt.it
81.21.20.169	A	res_paci43197d.ppp.twt.it
81.21.20.169	A	res_time11575.ppp.twt.it
81.21.20.173	A	res_area50326d.ppp.twt.it
81.21.20.173	A	res_ante19707.ppp.twt.it
81.21.20.199	A	res_mill42351d.ppp.twt.it
81.21.20.199	A	res_aton48386d.ppp.twt.it
81.21.20.199	A	res_paci11786.ppp.twt.it
81.21.20.208	A+PTR	res_kyn11538.ppp.twt.it
81.21.20.229	A	ufficiob.morelloforni.com
81.21.20.242	A	mail.son-energy.com
81.21.20.252	A	res_time11653.ppp.twt.it
81.21.20.252	A	res_tce36498d.ppp.twt.it
81.21.21.10	A	www.fma-ipi.it
81.21.21.10	A	mail.fma-ipi.it
81.21.21.10	A	fma-ipi.it
81.21.21.50	A+PTR	mail.keramosarredobagno.it
81.21.21.50	A	keramosarredobagno.it
81.21.21.74	A	top3.it
81.21.21.80	PTR	alfatt.it
81.21.21.202	A	smtp-in.studiosgr.it
81.21.21.238	A	coopmarta.it
81.21.21.238	A	mail.coopmarta.it
81.21.22.85	A	mail.baumuller.it
81.21.22.116	A	smtp2.mcdatasrl.it
81.21.22.126	A	deltapixelgps.com
81.21.23.116	PTR	smtp.mcdatasrl.it
81.21.24.7	A	res_area20690.ppp.twt.it
81.21.24.7	A	res_tele11977.ppp.twt.it
81.21.24.19	A+PTR	res_tele11996.ppp.twt.it
81.21.24.19	A+PTR	res_team36421d.ppp.twt.it
81.21.24.30	A	sbs.macc.it
81.21.24.36	A	res_dcom25243d.ppp.twt.it
81.21.24.36	A	res_vtel11986.ppp.twt.it
81.21.24.37	A	res_tele12035.ppp.twt.it
81.21.24.43	A	res_2knt15651d.ppp.twt.it
81.21.24.56	A	res_vtel12013.ppp.twt.it
81.21.24.57	A	res_plus32375d.ppp.twt.it
81.21.24.57	A	res_tele12051.ppp.twt.it
81.21.24.69	A	res_mill27827d.ppp.twt.it
81.21.24.69	A	res_anet11182.ppp.twt.it
81.21.24.69	A	res_vtel15620.ppp.twt.it
81.21.24.125	A	res_vtel12033.ppp.twt.it
81.21.24.125	A	res_area50323d.ppp.twt.it
81.21.24.125	A	res_mill20719.ppp.twt.it
81.21.24.161	A+PTR	res_aton12849.ppp.twt.it
81.21.24.161	A+PTR	res_tgi44928d.ppp.twt.it
81.21.24.161	A	res-tgi44928d.ppp.twt.it
81.21.24.162	PTR	res_plus12588.ppp.twt.it
81.21.24.162	PTR	res_unica41036d.ppp.twt.it
81.21.24.162	A+PTR	res_wens55643d.ppp.twt.it
81.21.24.186	A	smtp.elettrotecnicabc.com
81.21.24.186	A	res_voxd24627d.ppp.twt.it
81.21.24.219	A	nethsvr01.cetomedio.it
81.21.24.234	A	res-tcom31547d.ppp.twt.it
81.21.24.234	A	res-tele12480.ppp.twt.it
81.21.25.1	PTR	res_vtel12107.ppp.twt.it
81.21.25.6	A	res_plus24422d.ppp.twt.it
81.21.25.6	A	res_vtel12110.ppp.twt.it
81.21.25.31	A	res_sen29386d.ppp.twt.it
81.21.25.31	A	res_vtel12178.ppp.twt.it
81.21.25.32	A	mail1.fedabo.com
81.21.25.33	PTR	res_vtel12181.ppp.twt.it
81.21.25.39	A	res_fly32190d.ppp.twt.it
81.21.25.39	A	res_tele12547.ppp.twt.it
81.21.25.39	A	res_nwb53098d.ppp.twt.it
81.21.25.62	A	res_itso36572d.ppp.twt.it
81.21.25.62	A	res_team25620d.ppp.twt.it
81.21.25.62	A	res_vtel12484.ppp.twt.it
81.21.25.77	A	res_paci12726.ppp.twt.it
81.21.25.79	A	res_vtel12806.ppp.twt.it
81.21.25.79	A	res_sis36577v.ppp.twt.it
81.21.25.83	PTR	res-time12612.ppp.twt.it
81.21.25.83	PTR	res-aton60409d.ppp.twt.it
81.21.25.83	A	mail2.vsb.biz
81.21.25.91	A	res_vox12952v.ppp.twt.it
81.21.25.99	PTR	res-leo19552v.ppp.twt.it
81.21.25.99	PTR	res-vtel12436.ppp.twt.it
81.21.25.99	A	res_leo19552v.ppp.twt.it
81.21.25.102	A	res_aton12648.ppp.twt.it
81.21.25.103	A	res-mill29505d.ppp.twt.it
81.21.25.138	A	res_kntd42842d.ppp.twt.it
81.21.25.138	A	res_vtel13055.ppp.twt.it
81.21.25.138	A	res_pho36681d.ppp.twt.it
81.21.25.147	A+PTR	res_vtel12756.ppp.twt.it
81.21.25.147	A+PTR	res_tce29024d.ppp.twt.it
81.21.25.153	A	res_prm30881d.ppp.twt.it
81.21.25.153	A	res_aton25466d.ppp.twt.it
81.21.25.161	A+PTR	res_vtel12137.ppp.twt.it
81.21.25.187	A	res_2knt18774d.ppp.twt.it
81.21.25.187	A	res_adtl12803.ppp.twt.it
81.21.25.188	A	res_time12592.ppp.twt.it
81.21.25.196	A	res_vtel12502.ppp.twt.it
81.21.25.205	A	res_bmm13147.ppp.twt.it
81.21.25.210	PTR	res_2knt13045v.ppp.twt.it
81.21.25.210	PTR	res_tege13739.ppp.twt.it
81.21.25.210	A	mail.studiolaffusa.it
81.21.25.212	A	res_2knt13049v.ppp.twt.it
81.21.25.212	A	res_tce15685.ppp.twt.it
81.21.25.212	A	res_vtel13798.ppp.twt.it
81.21.25.228	A	res_bies11444d.ppp.twt.it
81.21.25.231	A	res_vtel13820.ppp.twt.it
81.21.25.231	A	res_2knt13048v.ppp.twt.it
81.21.25.232	A	res_eli13126.ppp.twt.it
81.21.25.247	A	mail.koinecoopsociale.it
81.21.25.254	A	res_vtel12177.ppp.twt.it
81.21.26.34	A	mail2.isotex.it
81.21.26.194	A	mail.capetti.it
81.21.26.195	A	srvweb-01.capettiservices.net
81.21.27.190	PTR	mail.silik.com
81.21.28.1	A+PTR	res_tlc13121.ppp.twt.it
81.21.28.2	A+PTR	res_mill13299.ppp.twt.it
81.21.28.2	A+PTR	res_penta31169d.ppp.twt.it
81.21.28.3	PTR	res_mill13300.ppp.twt.it
81.21.28.9	A	res_unica54286d.ppp.twt.it
81.21.28.22	A	res_aton31394d.ppp.twt.it
81.21.28.22	A	res_vtel12938.ppp.twt.it
81.21.28.27	A	res_voxd24961d.ppp.twt.it
81.21.28.27	A	res_vtel12880.ppp.twt.it
81.21.28.32	PTR	res_vtel12932.ppp.twt.it
81.21.28.34	A+PTR	res_bies19411v.ppp.twt.it
81.21.28.34	A+PTR	res_vtel12927.ppp.twt.it
81.21.28.34	A+PTR	res_vox20794v.ppp.twt.it
81.21.28.35	PTR	res_miller36332d.ppp.twt.it
81.21.28.37	A	res_vtel12924.ppp.twt.it
81.21.28.54	A	res_site13161v.ppp.twt.it
81.21.28.54	A	res_fon48284d.ppp.twt.it
81.21.28.55	A	res_2knt13162d.ppp.twt.it
81.21.28.55	A	res_ante18800d.ppp.twt.it
81.21.28.67	PTR	res_time13261.ppp.twt.it
81.21.28.68	A	res_sis31268d.ppp.twt.it
81.21.28.68	A	res_aton13172.ppp.twt.it
81.21.28.70	A	res_unica26767d.ppp.twt.it
81.21.28.70	A	res_vtel25781d.ppp.twt.it
81.21.28.242	A+PTR	res_leo13492d.ppp.twt.it
81.21.28.252	A	mail.nwpbx.it
81.21.28.252	A	arrow2.newassistent.it
81.21.29.53	A+PTR	mx2.totalcom.it
81.21.29.53	A	mx2.totalcom.info
81.21.29.55	A	ns3.totalcom.info
81.21.29.133	A	mail.ilfanale.com
81.21.29.133	A	mail.torremato.com
81.21.29.133	A	ilfanale.dyndns.biz
81.21.29.196	A	mail3.autobarbieri.com
81.21.29.196	A	mail3.blgspa.it
81.21.29.234	A	mx.prismatdi.it
81.21.29.250	A+PTR	mail.professionisti-associati.pro
81.21.29.250	A	autodiscover.professionisti-associati.pro
81.21.30.63	A	res_vtel13772.ppp.twt.it
81.21.30.73	A	mail.robertoriccidesigns.com
81.21.30.146	A+PTR	res_tre13804.ppp.twt.it
81.21.30.146	PTR	res_vox13903d.ppp.twt.it
81.21.30.146	PTR	res_unica50185d.ppp.twt.it
81.21.30.164	A	mail.cassidy.it
81.21.30.164	A	mail.gvo.it
81.21.30.164	A	mail.meteobiella.it
81.21.30.180	A	res-aton13791.ppp.twt.it
81.21.30.196	A	res_cgm14038.ppp.twt.it
81.21.30.217	A	res_tce14128.ppp.twt.it
81.21.30.220	A	res-aton14127.ppp.twt.it
81.21.30.220	A	res-dcom15515.ppp.twt.it
81.21.30.243	PTR	res_anet14089.ppp.twt.it
81.21.31.136	A+PTR	res-cst48817d.ppp.twt.it
81.21.31.136	A	iterinformatica.it
81.21.31.136	A	www.iterinformatica.it
81.21.31.166	A+PTR	res-tce48557d.ppp.twt.it