Robtex

Up: 212.73.138.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 212.73.138.0/25
Down right: 212.73.138.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
212.73.138.0	PTR	212.73.138.0.neterra.net
212.73.138.5	A	mail.knezha-leader.com
212.73.138.6	PTR	dveribg.net
212.73.138.8	PTR	212.73.138.8.neterra.net
212.73.138.9	PTR	212.73.138.9.neterra.net
212.73.138.12	PTR	212.73.138.12.neterra.net
212.73.138.12	A	plovdiv.neterra.net
212.73.138.26	PTR	mail.big.bg
212.73.138.38	A+PTR	sns.neterra.net
212.73.138.38	A	dns2.edirnet.com.tr
212.73.138.44	PTR	212.73.138.44.neterra.net
212.73.138.44	A	sns.neterra.net
212.73.138.51	A+PTR	lin.nimahosts.com
212.73.138.51	A	nimahosts.com
212.73.138.51	A	bgelement.com
212.73.138.52	A+PTR	sun.stampii.com
212.73.138.52	A	stampii.com
212.73.138.53	A+PTR	mail.nimahosts.com
212.73.138.53	A	mail.spimise.com
212.73.138.53	A	mail.vivacomfort.net
212.73.138.54	PTR	vhost1.flgr.bg
212.73.138.54	A	ns2.invest.bg
212.73.138.54	A	ns1.invest.bg
212.73.138.55	A+PTR	nebula.nimasystems.com
212.73.138.55	A	solnastaiaplovdiv.com
212.73.138.55	A	piraprint.com
212.73.138.57	PTR	212.73.138.57.neterra.net
212.73.138.57	A	ns1.invest.bg
212.73.138.57	A	storage.lan.bgmiracle.com
212.73.138.90	PTR	mail.sbytes.net
212.73.138.98	PTR	212.73.138.98.neterra.net
212.73.138.106	PTR	212.73.138.106.neterra.net
212.73.138.141	A	mail.heinecke.ch
212.73.138.141	A	heinecke.ch
212.73.138.141	A	datacare.ch
212.73.138.218	PTR	www.tamiweb.com
212.73.138.228	PTR	alpha.promopartners.net
212.73.138.252	PTR	web.teracomm.bg
212.73.138.252	A	gamespace.bg
212.73.138.252	A	allterpay.com
212.73.138.253	PTR	web2.teracomm.bg
212.73.138.253	A	ns2.lovemeter.us
212.73.138.253	A	breedband-shop.eu