Robtex

Up: 83.228.0.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 83.228.0.0/23
Down right: 83.228.2.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
83.228.0.4	PTR	83-228-0-4.ip.btc-net.bg
83.228.0.24	A+PTR	83-228-0-24.ip.btc-net.bg
83.228.0.42	A+PTR	83-228-0-42.ip.btc-net.bg
83.228.0.44	A+PTR	83-228-0-44.ip.btc-net.bg
83.228.0.66	PTR	83-228-0-66.ip.btc-net.bg
83.228.0.80	PTR	83-228-0-80.ip.btc-net.bg
83.228.0.89	A+PTR	83-228-0-89.ip.btc-net.bg
83.228.0.97	A+PTR	83-228-0-97.ip.btc-net.bg
83.228.0.98	A+PTR	83-228-0-98.ip.btc-net.bg
83.228.0.101	PTR	83-228-0-101.ip.btc-net.bg
83.228.0.104	PTR	104-0-228-83.btc-net.bg
83.228.0.118	PTR	118-0-228-83.btc-net.bg
83.228.0.136	PTR	83-228-0-136.ip.btc-net.bg
83.228.0.136	A	zahariev.net
83.228.0.137	A+PTR	83-228-0-137.ip.btc-net.bg
83.228.0.138	A+PTR	83-228-0-138.ip.btc-net.bg
83.228.0.139	A+PTR	83-228-0-139.ip.btc-net.bg
83.228.0.173	A+PTR	83-228-0-173.ip.btc-net.bg
83.228.0.187	A+PTR	83-228-0-187.ip.btc-net.bg
83.228.0.192	PTR	192-0-228-83.btc-net.bg
83.228.0.192	A	ns1.b-link.info
83.228.0.192	A	mx.b-link.info
83.228.0.193	A+PTR	83-228-0-193.ip.btc-net.bg
83.228.0.198	A+PTR	83-228-0-198.ip.btc-net.bg
83.228.0.215	PTR	215-0-228-83.btc-net.bg
83.228.0.237	A+PTR	83-228-0-237.ip.btc-net.bg
83.228.0.242	A	242-0-228-83.btc-net.bg
83.228.1.3	PTR	3-1-228-83.btc-net.bg
83.228.1.24	A+PTR	83-228-1-24.ip.btc-net.bg
83.228.1.74	PTR	83-228-1-74.ip.btc-net.bg
83.228.1.74	A	mx2.amz-bg.com
83.228.1.102	PTR	102-1-228-83.btc-net.bg
83.228.1.102	A	adishomes.com
83.228.1.102	A	mail.adishomes.com
83.228.1.115	A+PTR	mail.raicommerce-bg.com
83.228.1.115	A	raicommerce-bg.com
83.228.1.117	A+PTR	83-228-1-117.ip.btc-net.bg
83.228.1.251	PTR	251-1-228-83.btc-net.bg
83.228.1.251	A	mail.seattable.net
83.228.1.253	PTR	mail.maxcard.bg
83.228.1.253	A	eva-dolls.net
83.228.1.253	A	mail.eva-dolls.net
83.228.2.116	A+PTR	83-228-2-116.ip.btc-net.bg
83.228.3.34	PTR	83-228-3-34.ip.btc-net.bg
83.228.3.34	A	mx.native-bg.com
83.228.3.51	PTR	51-3-228-83.btc-net.bg
83.228.3.51	A	raicommerce.org
83.228.3.59	A+PTR	83-228-3-59.ip.btc-net.bg
83.228.3.117	PTR	117-3-228-83.btc-net.bg
83.228.3.117	A	mbox.elcostar.com
83.228.3.117	A	mail.elcostar.com
83.228.3.170	A+PTR	83-228-3-170.ip.btc-net.bg
83.228.3.189	A+PTR	83-228-3-189.ip.btc-net.bg
83.228.3.190	A+PTR	83-228-3-190.ip.btc-net.bg
83.228.3.196	PTR	196-3-288-83.btc-net.bg
83.228.3.196	A	mx.expat.bg
83.228.3.198	A+PTR	83-228-3-198.ip.btc-net.bg
83.228.3.201	A+PTR	83-228-3-201.ip.btc-net.bg