Robtex

Up: 78.153.212.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 78.153.212.0/25
Down right: 78.153.212.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
78.153.212.20	A+PTR	exchange.blacknight.com
78.153.212.32	A+PTR	smtp-out.blacknight.com
78.153.212.33	A+PTR	smtp-out.blacknight.com
78.153.212.40	PTR	smtp.blacknight.com
78.153.212.40	A	mail.d1265446-25415.blacknight.com
78.153.212.40	A	mail.d1519448-110077.blacknight.com
78.153.212.41	PTR	smtp.rozmichostedexchange.com
78.153.212.70	A	auth.blacknight.com
78.153.212.80	A	imap.blacknight.com
78.153.212.80	A	pop3.blacknight.com
78.153.212.132	A	webmail.accountancyfocus.ie
78.153.212.132	A	webmail.ballastsigns.ie
78.153.212.133	A	cp.blacknight.com
78.153.212.135	A	uscp.blacknight.com
78.153.212.136	A	usstore.blacknight.com
78.153.212.137	A	ukstore.blacknight.com
78.153.212.137	A	ukcp.blacknight.com
78.153.212.138	A	ukstore.blacknight.com
78.153.212.140	A	blacknight.market
78.153.212.140	A	www.blacknight.market
78.153.212.166	A+PTR	bm.blacknight.com
78.153.212.168	PTR	cp.blacknight.com
78.153.212.168	A	1stpay.cc
78.153.212.168	A	ftp.cp.blacknight.com
78.153.212.169	A+PTR	watchdog.blacknight.com
78.153.212.171	A+PTR	reseller.blacknight.com
78.153.212.172	PTR	pemsslpr01.blacknight.com
78.153.212.172	A	rodol.com
78.153.212.172	A	seanaredmondmusic.com
78.153.212.173	PTR	parking.blacknight.com
78.153.212.173	A	irishperch.ie
78.153.212.173	A	inspirepromotionalproducts.ie
78.153.212.176	A+PTR	ns1.blacknight.com
78.153.212.176	A	ns1.ayarya.com
78.153.212.176	A	ns1.gigastence.ie
78.153.212.228	PTR	s1-se.blacknight.ie
78.153.212.228	A	antispam.radleys.ie
78.153.212.228	A	av-priv.blacknight.ie
78.153.212.229	PTR	s2-se.blacknight.ie
78.153.212.229	A	antispam.radleys.ie
78.153.212.229	A	av-priv.blacknight.ie
78.153.212.230	A+PTR	s1a-se.blacknight.ie
78.153.212.231	A+PTR	s2a-se.blacknight.ie
78.153.212.232	A+PTR	s1b-se.blacknight.ie
78.153.212.233	A+PTR	s2b-se.blacknight.ie