Robtex

Up: 213.91.168.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 213.91.168.0/23
Down right: 213.91.170.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
213.91.170.4	A+PTR	213-91-170-4.ip.btc-net.bg
213.91.170.6	A+PTR	213-91-170-6.ip.btc-net.bg
213.91.170.10	A+PTR	smtp1.cez.bg
213.91.170.10	A	mail.cez-rp.bg
213.91.170.10	A	mail.cez-trade.bg
213.91.170.11	PTR	sv400052-v.cez.bg
213.91.170.12	A+PTR	sv400084.cez.bg
213.91.170.12	A	electro-sofobl.com
213.91.170.12	A	ns2.cez.bg
213.91.170.14	PTR	213-91-170-14.ip.btc-net.bg
213.91.170.15	A	mail.electro-sofobl.com
213.91.170.20	A+PTR	213-91-170-20.ip.btc-net.bg
213.91.170.21	PTR	213-91-170-21.ip.btc-net.bg
213.91.170.21	A	cezelectro.bg
213.91.170.23	A+PTR	213-91-170-23.ip.btc-net.bg
213.91.170.25	PTR	213-91-170-25.ip.btc-net.bg
213.91.170.27	PTR	213-91-170-27.ip.btc-net.bg
213.91.170.27	A	webmail.cez.bg
213.91.170.29	A+PTR	213-91-170-29.ip.btc-net.bg
213.91.170.32	A+PTR	213-91-170-32.ip.btc-net.bg
213.91.170.33	PTR	213-91-170-33.ip.btc-net.bg
213.91.170.41	PTR	213.91.170-41.btc-net.bg
213.91.170.41	A	sv400049-v.cezbg.eu
213.91.170.42	PTR	213.91.170-42.btc-net.bg
213.91.170.42	A	sv400050-v.cezbg.eu
213.91.170.45	A+PTR	213-91-170-45.ip.btc-net.bg
213.91.170.47	A+PTR	213-91-170-47.ip.btc-net.bg
213.91.170.50	A+PTR	213-91-170-50.ip.btc-net.bg
213.91.170.57	A+PTR	213-91-170-57.ip.btc-net.bg
213.91.170.61	A+PTR	213-91-170-61.ip.btc-net.bg
213.91.170.62	A+PTR	213-91-170-62.ip.btc-net.bg
213.91.170.63	A+PTR	213-91-170-63.ip.btc-net.bg
213.91.170.64	A+PTR	213-91-170-64.ip.btc-net.bg
213.91.170.70	A+PTR	213-91-170-70.ip.btc-net.bg
213.91.170.82	A+PTR	213-91-170-82.ip.btc-net.bg
213.91.170.88	A+PTR	213-91-170-88.ip.btc-net.bg
213.91.170.90	A+PTR	213-91-170-90.ip.btc-net.bg
213.91.170.94	A+PTR	213-91-170-94.ip.btc-net.bg
213.91.170.96	A+PTR	213-91-170-96.ip.btc-net.bg
213.91.170.101	PTR	213.91.170-101.btc-net.bg
213.91.170.104	PTR	213.91.170-104.btc-net.bg
213.91.170.119	PTR	213.91.170-119.btc-net.bg
213.91.170.127	A+PTR	213-91-170-127.ip.btc-net.bg
213.91.170.139	A+PTR	213-91-170-139.ip.btc-net.bg
213.91.170.146	A+PTR	213-91-170-146.ip.btc-net.bg
213.91.170.157	PTR	213-91-170-157.ip.btc-net.bg
213.91.170.167	A+PTR	213-91-170-167.ip.btc-net.bg
213.91.170.168	A+PTR	213-91-170-168.ip.btc-net.bg
213.91.170.183	A+PTR	213-91-170-183.ip.btc-net.bg
213.91.170.184	A+PTR	213-91-170-184.ip.btc-net.bg
213.91.170.200	A+PTR	213-91-170-200.ip.btc-net.bg
213.91.170.210	A+PTR	213-91-170-210.ip.btc-net.bg
213.91.170.235	A+PTR	213-91-170-235.ip.btc-net.bg
213.91.170.247	A+PTR	213-91-170-247.ip.btc-net.bg
213.91.170.254	A+PTR	213-91-170-254.ip.btc-net.bg
213.91.171.2	A+PTR	mail.unionbank.bg
213.91.171.3	PTR	3_171.unionbank.bg
213.91.171.4	A+PTR	emx1.unionbank.bg
213.91.171.6	A+PTR	emx2.unionbank.bg
213.91.171.250	PTR	250_171.unionbank.bg