Robtex

Up: 116.12.88.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 116.12.88.0/23
Down right: 116.12.90.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
116.12.88.1	A	mail.chec.lk
116.12.88.3	A+PTR	mail.chec.lk
116.12.88.3	A	chec.lk
116.12.88.4	A+PTR	mail.cccsl.lk
116.12.88.6	PTR	mail.chec.lk
116.12.88.17	PTR	mail.jnyi.lk
116.12.88.98	A+PTR	mail.wtc.lk
116.12.88.98	A	mail.realty.lk
116.12.88.110	A+PTR	bratexsl.com
116.12.88.110	A	webmail.bratexsl.com
116.12.88.150	PTR	mail.connaissance.lk
116.12.88.150	PTR	mail.themeresorts.com
116.12.88.150	PTR	mail.traveldesignbycdc.com
116.12.88.163	PTR	mail.flinteclk.com
116.12.88.163	PTR	mail.straintec.com
116.12.88.227	A+PTR	maillanka.chamber.lk
116.12.88.227	A	mail.chamber.lk
116.12.89.78	PTR	hil-res
116.12.89.109	A	dns1.electroteks.com
116.12.89.130	A+PTR	mail.dynawashlimited.com
116.12.89.130	A+PTR	mail.lankaequities.com
116.12.89.130	A+PTR	mail.coolandcool.lk
116.12.89.163	A	dns1.electroteks.com
116.12.89.164	A	mail.electroteks.com
116.12.89.166	A	castoom.com
116.12.89.166	A	www.electroteks.com
116.12.89.166	A	dns2.electroteks.com
116.12.89.215	PTR	mail.cse.lk
116.12.90.68	A+PTR	mail.baurs.com
116.12.90.70	A	mailsvr.baurs.com
116.12.90.75	A	icbtsis.lk
116.12.90.155	A	s2sbp.com
116.12.90.250	A+PTR	mail.vidullanka.com
116.12.90.250	A	mail.tradefirst.lk
116.12.91.20	A+PTR	mail.diamond.lk
116.12.91.150	PTR	mail.csctp.lk
116.12.91.150	A	www.csctp.lk
116.12.91.164	PTR	mail.sjmsassociates.com
116.12.91.164	A	sjmsassociates.com
116.12.91.166	A+PTR	mail.accsec.lk
116.12.91.220	A+PTR	mail.globallanka.com
116.12.91.222	A	mail.globallanka.com