Robtex

Up: 37.143.80.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 37.143.84.0/23
Down right: 37.143.86.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
37.143.84.4	PTR	4-84-143-37.ftth.glasoperator.nl
37.143.84.4	A	mail.agroburen.nl
37.143.84.46	PTR	46-84-143-37.ftth.glasoperator.nl
37.143.84.91	PTR	91-84-143-37.ftth.glasoperator.nl
37.143.84.91	A	mail.forma.eu
37.143.84.98	PTR	98-84-143-37.ftth.glasoperator.nl
37.143.84.99	PTR	99-84-143-37.ftth.glasoperator.nl
37.143.84.99	A	bodegraven.org
37.143.84.99	A	mail.quicklyhosting.nl
37.143.84.101	PTR	101-84-143-37.ftth.glasoperator.nl
37.143.84.110	PTR	110-84-143-37.ftth.glasoperator.nl
37.143.84.110	A	mail.hartol.nl
37.143.84.228	A+PTR	public-dns-primary.glasoperator.nl
37.143.84.229	PTR	229-84-143-37.ftth.glasoperator.nl
37.143.85.76	PTR	76-85-143-37.ftth.glasoperator.nl
37.143.85.76	A	r1.sn-ui0pn-5hne.googlevideo.com
37.143.85.76	A	r1---sn-ui0pn-5hne.googlevideo.com
37.143.85.77	PTR	77-85-143-37.ftth.glasoperator.nl
37.143.85.77	A	r2.sn-ui0pn-5hne.gvt1.com
37.143.85.78	PTR	78-85-143-37.ftth.glasoperator.nl
37.143.85.79	PTR	79-85-143-37.ftth.glasoperator.nl
37.143.85.98	PTR	98-85-143-37.ftth.glasoperator.nl
37.143.85.98	A	mail.van-amerongen.com
37.143.85.201	PTR	201-85-143-37.ftth.glasoperator.nl
37.143.85.224	A	our-office.nl
37.143.85.224	A	mail.our-office.nl
37.143.85.238	A	thuis.selimovic.nl
37.143.86.12	PTR	12-86-143-37.gcc2.glasoperator.nl
37.143.86.12	A	r1.sn-ui0pn-5hnl.gvt1.com
37.143.86.12	A	r1.sn-ui0pn-5hnl.googlevideo.com
37.143.86.13	PTR	13-86-143-37.ftth.glasoperator.nl
37.143.86.13	A	r2.sn-ui0pn-5hnl.gvt1.com
37.143.86.14	PTR	14-86-143-37.ftth.glasoperator.nl
37.143.86.15	PTR	15-86-143-37.ftth.glasoperator.nl
37.143.86.26	A+PTR	26-86-143-37.ftth.glasoperator.nl
37.143.86.32	PTR	32-86-143-37.ftth.glasoperator.nl
37.143.86.32	A	klav.nl
37.143.86.32	A	mail.tramflirt.nl
37.143.86.34	PTR	34-86-143-37.ftth.glasoperator.nl
37.143.86.34	A	occ-0-1225-769.1.nflxso.net
37.143.86.50	PTR	50-86-143-37.ftth.glasoperator.nl
37.143.86.50	A	occ-0-1225-769.1.nflxso.net
37.143.86.66	A	occ-0-1226-768.1.nflxso.net
37.143.86.66	A	occ-0-1226-769.1.nflxso.net
37.143.86.68	A	myxbmc.nl
37.143.86.82	A	occ-0-1226-768.1.nflxso.net
37.143.86.82	A	occ-0-1226-769.1.nflxso.net
37.143.86.108	A	108-86-143-37.ftth.glasoperator.nl
37.143.86.109	A	109-86-143-37.ftth.glasoperator.nl
37.143.86.185	A	mx1.ftb-nederland.nl
37.143.87.0	PTR	network.ftth.glasoperator.nl
37.143.87.96	A+PTR	96-87-143-37.ftth.glasoperator.nl
37.143.87.128	PTR	network.ftth.glasoperator.nl
37.143.87.200	A	mail.xytch.net
37.143.87.207	A+PTR	207-87-143-37.ftth.glasoperator.nl
37.143.87.255	PTR	broadcast.ftth.glasoperator.nl