Robtex

Up: 217.79.76.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 217.79.77.0/25
Down right: 217.79.77.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
217.79.77.1	PTR	router.balchik.heros-bg.net
217.79.77.1	A	balchik.heros-bg.net
217.79.77.3	A+PTR	ftp.balchik.heros-bg.net
217.79.77.3	A	balchik.heros-bg.net
217.79.77.9	A	evropa.balchik.heros-bg.net
217.79.77.10	A	tnt.balchik.heros-bg.net
217.79.77.32	PTR	bulgaria.dnsttl.com
217.79.77.34	PTR	bulgaria.dnsttl.com
217.79.77.34	A	kiok.telecoms.bg
217.79.77.37	A	rangochev.gw.telecoms.bg
217.79.77.38	A+PTR	rangochev.telecoms.bg
217.79.77.46	A	fulhamcleaningcompany.co.uk
217.79.77.46	A	emergencyhandyman.co.uk
217.79.77.46	A	mail2.fulhamcleaningcompany.co.uk
217.79.77.50	PTR	muk.bg
217.79.77.51	PTR	router.muk.bg
217.79.77.56	A	lan3.varna.heros-bg.net
217.79.77.57	A	lan4.varna.heros-bg.net
217.79.77.60	PTR	balchik.heros-bg.net
217.79.77.61	PTR	varchev.com
217.79.77.98	PTR	server.correct.bg
217.79.77.98	A	www.office-promo.com
217.79.77.98	A	viauno.bg
217.79.77.99	PTR	server2.correct.bg
217.79.77.99	A	offex.bg
217.79.77.99	A	www.offex.bg
217.79.77.100	A	abv-market.bg
217.79.77.100	A	www.abv-market.bg
217.79.77.105	PTR	nardel.gw.correct.bg
217.79.77.105	A	mx5.officeexpress.bg
217.79.77.106	PTR	itien.nardelo.bg
217.79.77.106	A	mx6.officeexpress.bg
217.79.77.107	A	mx4.officeexpress.bg
217.79.77.108	A	mx3.officeexpress.bg
217.79.77.109	A+PTR	mx1.officeexpress.bg
217.79.77.109	A	officesale-bg.com
217.79.77.109	A	stol4e.com
217.79.77.110	A+PTR	mx2.officeexpress.bg
217.79.77.112	PTR	vpn1.kiok.telecoms.bg
217.79.77.113	PTR	nat1.kiok.telecoms.bg
217.79.77.115	PTR	unknown.kiok.telecoms.bg
217.79.77.122	A	sasho.telecoms.bg
217.79.77.125	A	mandova.gw.telecoms.bg
217.79.77.126	A	mandova.telecoms.bg