$ whois -h whois.radb.net fltr-martian
filter-set: fltr-martian
filter:     {
            0.0.0.0/8^+ ,
            10.0.0.0/8^+ ,
            127.0.0.0/8^+ ,
            169.254.0.0/16^+ ,
            172.16.0.0/12^+ ,
            192.0.2.0/24^+ ,
            192.168.0.0/16^+ ,
            198.18.0.0/15^+ ,
            224.0.0.0/3^+
            }
descr:      Special use and reserved IPv4 prefixes.
remarks:    For the complete set of bogons, please see:
            fltr-unallocated - unallocated prefixes.
            fltr-bogons - fltr-unallocated + fltr-martian.
            http://www.cymru.com/Documents/bogon-list.html
admin-c:    Rob Thomas RT624
tech-c:     Rob Thomas RT624
notify:     radb@cymru.com
mnt-by:     MAINT-BOGON-FILTERS
changed:    radb@cymru.com 20021229
changed:    radb@cymru.com 20021230
changed:    radb@cymru.com 20021230
source:     RADB
...