Robtex

Up: 212.21.138.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 212.21.139.0/25
Down right: 212.21.139.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
212.21.139.3	A+PTR	mail.armeec.bg
212.21.139.4	PTR	4.139.21.212-rev.novatel.bg
212.21.139.4	A	*.armeec.bg
212.21.139.4	A	appspot.com--www.ypshy.com
212.21.139.6	A+PTR	help.armeec.bg
212.21.139.7	A+PTR	contacts.armeec.bg
212.21.139.130	A+PTR	mx.armeec.bg