Robtex

Up: 5.83.96.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 5.83.96.0/21
Down right: 5.83.104.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
5.83.96.50	A+PTR	mail.chartwells.net
5.83.96.50	A	mail.clementineinsurance.com
5.83.96.50	A	email.clementineinsurance.com
5.83.96.58	PTR	mail.linbrooke.co.uk
5.83.97.38	PTR	remote.tripleline.com
5.83.97.38	A	mail2.tripleline.com
5.83.97.138	A	mail.rossendalegroup.co.uk
5.83.97.250	A	mail.osteopathy.org
5.83.98.16	A+PTR	mail.itnetuk.com
5.83.98.63	PTR	mail.hadilaw.com
5.83.98.76	PTR	mail.yarrington.co.uk
5.83.98.113	PTR	harrisonsllp.com
5.83.98.209	PTR	mail2.ziptechservices.co.uk
5.83.98.209	A	mail.ziptechservices.com
5.83.99.68	A	jackandcable.com
5.83.99.76	A	nwpcreative.com
5.83.99.81	A	object-source.com
5.83.99.86	A	lorchidee.co.uk
5.83.99.93	A	gayvon.com
5.83.100.97	PTR	mail.krssltd.com
5.83.100.97	A	mail.krssengineering.com
5.83.101.38	A	mail.gillakaster.com
5.83.101.178	PTR	mail.plmr.co.uk
5.83.102.147	A	mx1.provc.com
5.83.102.162	PTR	5-83-102-162.evanshillington.mezzonet.net
5.83.102.162	A	evanshillington.mezzonet.net
5.83.102.196	A+PTR	mail.mooreallen.co.uk
5.83.103.234	PTR	remote.hunterpage.net
5.83.104.129	A+PTR	easignws.setacom.it
5.83.104.130	A+PTR	mailralay01.setacom.it
5.83.104.130	A	mx3.lavorocalabria.it
5.83.104.131	A+PTR	itftp.setacom.it
5.83.104.132	PTR	gwvlan618blade.setacom.it
5.83.104.139	A	mail.setacom.it
5.83.104.144	A+PTR	czftp.setacom.it
5.83.104.145	A+PTR	telecrec.setacom.it
5.83.104.146	A+PTR	rdptunisimultises02.setacom.it
5.83.104.147	A+PTR	natinternetvlanamm.setacom.it
5.83.104.160	PTR	czdbclusterbalancer01.setacom.it
5.83.104.161	A+PTR	destnatczfeasrv01svil.setacom.it
5.83.104.162	A+PTR	czstun.setacom.it
5.83.104.163	A+PTR	ipsecarchiviomarcellinara.setacom.it
5.83.104.164	A	caseevilleovunque.com
5.83.104.250	PTR	ns5.setacom.it
5.83.104.250	A	ns5.georeti.net
5.83.104.251	PTR	ns6.setacom.it
5.83.104.251	A	ns6.georeti.net
5.83.104.252	A	posta.firmasemplice.com
5.83.104.252	A	mail.setacom.it
5.83.104.253	PTR	destnatns5.setacom.it