Robtex

Up: 91.208.12.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 91.208.13.0/25
Down right: 91.208.13.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
91.208.13.0	A+PTR	000-013-208-091.ip-addr.inexio.net
91.208.13.2	A+PTR	002-013-208-091.ip-addr.inexio.net
91.208.13.3	A+PTR	003-013-208-091.ip-addr.inexio.net
91.208.13.4	A+PTR	004-013-208-091.ip-addr.inexio.net
91.208.13.5	A+PTR	005-013-208-091.ip-addr.inexio.net
91.208.13.11	A+PTR	011-013-208-091.ip-addr.inexio.net
91.208.13.12	A+PTR	012-013-208-091.ip-addr.inexio.net
91.208.13.13	A+PTR	013-013-208-091.ip-addr.inexio.net
91.208.13.14	A+PTR	014-013-208-091.ip-addr.inexio.net
91.208.13.15	A	mail2.zwf.de
91.208.13.21	PTR	021-013-208-091.ip-addr.inexio.net
91.208.13.22	PTR	022-013-208-091.ip-addr.inexio.net
91.208.13.26	PTR	026-013-208-091.ip-addr.inexio.net
91.208.13.26	A	com-mannheim.de
91.208.13.26	A	mail.com-saarbruecken.de
91.208.13.40	A+PTR	mail.zwf.de
91.208.13.40	A	mail.zwf-events.de
91.208.13.40	A	mail.orgavision-nav.eu