Robtex

Up: 84.51.42.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 84.51.43.0/25
Down right: 84.51.43.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
84.51.43.18	PTR	host-84-51-43-18.teletektelekom.com
84.51.43.18	A	mail.kpa.com.tr
84.51.43.27	PTR	mail.alcorshipping.com
84.51.43.27	PTR	mail.alkorshipping.com
84.51.43.27	PTR	mail.goldforwarding.com
84.51.43.41	PTR	kimteks.com.tr
84.51.43.53	A	*.donmezlerlisans.com
84.51.43.55	A	mx2.donmezlerlisans.com
84.51.43.55	A	mx2.mariesturkiye.com
84.51.43.56	A	mx1.karakterdunyasi.com
84.51.43.56	A	mx1.emirkirtasiye.com
84.51.43.56	A	enmodacanta.com
84.51.43.59	A	ciftolalim.com
84.51.43.59	A	sanatsalboya.com
84.51.43.59	A	donmezlergroup.net
84.51.43.60	PTR	host-84-51-43-60.teletektelekom.com
84.51.43.60	A	ehdticaret.com
84.51.43.60	A	mx1.ehdticaret.com
84.51.43.61	A	mx1.donmezlerlisans.com
84.51.43.62	A	mx2.donmezlerlisans.com
84.51.43.62	A	mx1.donmezlerlisans.net
84.51.43.62	A	mx1.mariesturkiye.com
84.51.43.63	A	karakterdunyasi.com
84.51.43.99	PTR	host-84-51-43-99.teletektelekom.com
84.51.43.100	A+PTR	mail.leoburnett.com.tr
84.51.43.100	A	mail.arc-tr.com
84.51.43.100	A	mail.leopr-tr.com
84.51.43.180	A	ns1.guestranet.net
84.51.43.180	A	guestranet.net
84.51.43.180	A	ns1.ayzsoftware.com
84.51.43.197	A	ulkerakademi.com
84.51.43.207	A+PTR	autodiscover1.gi.com.tr
84.51.43.208	PTR	host-84-51-43-208.teletektelekom.com
84.51.43.219	PTR	mail.ulker.com.tr
84.51.43.226	PTR	seran.com.tr
84.51.43.226	PTR	mail.seran.com.tr
84.51.43.238	PTR	ns2.universalltd.com.tr
84.51.43.238	A	mail.serraseramik.com.tr
84.51.43.241	PTR	host-84-51-43-241.teletektelekom.com
84.51.43.241	A	mail.serraseramik.com.tr
84.51.43.241	A	mail.kaytanci.net
84.51.43.242	PTR	host-84-51-43-242.teletektelekom.com