These entries are queried from radb.net using whois, you can try my project getting these.
:AS22556 route: 64.124.103.0/24 descr: Blackboard Inc 650 Mass Ave, NW Washington, DC 20001 origin: AS22556 mnt-by: MAINT-AS22556 changed: josh [at] blackboard.com 20090108 #18:59:57Z source: RADB route: 64.124.104.0/24 descr: Blackboard Inc 650 Mass Ave, NW Washington, DC 20001 origin: AS22556 mnt-by: MAINT-AS22556 changed: josh [at] blackboard.com 20090108 #19:01:29Z source: RADB route: 64.124.144.0/24 descr: Blackboard Inc 650 Mass Ave, NW Washington, DC 20001 origin: AS22556 mnt-by: MAINT-AS22556 changed: josh [at] blackboard.com 20090108 #19:04:48Z source: RADB route: 64.125.200.0/22 descr: Blackboard Inc 650 Mass Ave, NW Washington, DC 20001 origin: AS22556 mnt-by: MAINT-AS22556 changed: josh [at] blackboard.com 20090108 #19:07:03Z source: RADB route: 64.125.200.0/24 descr: Blackboard Inc 650 Mass Ave, NW Washington, DC 20001 origin: AS22556 mnt-by: MAINT-AS22556 changed: josh [at] blackboard.com 20090108 #19:07:53Z source: RADB route: 64.125.201.0/24 descr: Blackboard Inc 650 Mass Ave, NW Washington, DC 20001 origin: AS22556 mnt-by: MAINT-AS22556 changed: josh [at] blackboard.com 20090108 #19:08:32Z source: RADB route: 64.125.202.0/24 descr: Blackboard Inc 650 Mass Ave, NW Washington, DC 20001 origin: AS22556 mnt-by: MAINT-AS22556 changed: josh [at] blackboard.com 20090108 #19:09:00Z source: RADB route: 64.125.203.0/24 descr: Blackboard Inc 650 Mass Ave, NW Washington, DC 20001 origin: AS22556 mnt-by: MAINT-AS22556 changed: josh [at] blackboard.com 20090108 #19:09:23Z source: RADB route: 209.133.107.0/24 descr: Blackboard Inc 650 Mass Ave, NW Washington, DC 20001 origin: AS22556 mnt-by: MAINT-AS22556 changed: josh [at] blackboard.com 20090108 #19:14:55Z source: RADB route: 209.133.124.0/24 descr: Blackboard Inc 650 Mass Ave, NW Washington, DC 20001 origin: AS22556 mnt-by: MAINT-AS22556 changed: josh [at] blackboard.com 20090108 #19:15:26Z source: RADB route: 209.133.125.0/24 descr: Blackboard Inc 650 Mass Ave, NW Washington, DC 20001 origin: AS22556 mnt-by: MAINT-AS22556 changed: josh [at] blackboard.com 20090108 #19:15:53Z source: RADB route: 209.133.127.0/24 descr: Blackboard Inc 650 Mass Ave, NW Washington, DC 20001 origin: AS22556 mnt-by: MAINT-AS22556 changed: josh [at] blackboard.com 20090108 #19:16:18Z source: RADB route: 209.133.74.0/24 descr: Blackboard Inc 650 Mass Ave, NW Washington, DC 20001 origin: AS22556 mnt-by: MAINT-AS22556 changed: josh [at] blackboard.com 20090108 #19:16:42Z source: RADB route: 209.133.75.0/24 descr: Blackboard Inc 650 Mass Ave, NW Washington, DC 20001 origin: AS22556 mnt-by: MAINT-AS22556 changed: josh [at] blackboard.com 20090108 #19:17:03Z source: RADB route: 209.133.88.0/24 descr: Blackboard Inc 650 Mass Ave, NW Washington, DC 20001 origin: AS22556 mnt-by: MAINT-AS22556 changed: josh [at] blackboard.com 20090108 #19:17:25Z source: RADB route: 209.133.89.0/24 descr: Blackboard Inc 650 Mass Ave, NW Washington, DC 20001 origin: AS22556 mnt-by: MAINT-AS22556 changed: josh [at] blackboard.com 20090108 #19:17:48Z source: RADB route: 209.133.91.0/24 descr: Blackboard Inc 650 Mass Ave, NW Washington, DC 20001 origin: AS22556 mnt-by: MAINT-AS22556 changed: josh [at] blackboard.com 20090108 #19:19:30Z source: RADB route: 209.133.92.0/24 descr: Blackboard Inc 650 Mass Ave, NW Washington, DC 20001 origin: AS22556 mnt-by: MAINT-AS22556 changed: josh [at] blackboard.com 20090108 #19:20:56Z source: RADB route: 209.249.169.0/24 descr: Blackboard Inc 650 Mass Ave, NW Washington, DC 20001 origin: AS22556 mnt-by: MAINT-AS22556 changed: josh [at] blackboard.com 20090108 #19:21:19Z source: RADB route: 216.200.106.0/24 descr: Blackboard Inc 650 Mass Ave, NW Washington, DC 20001 origin: AS22556 mnt-by: MAINT-AS22556 changed: josh [at] blackboard.com 20090108 #19:21:43Z source: RADB route: 216.200.107.0/24 descr: Blackboard Inc 650 Mass Ave, NW Washington, DC 20001 origin: AS22556 mnt-by: MAINT-AS22556 changed: josh [at] blackboard.com 20090108 #19:22:00Z source: RADB route: 216.200.108.0/24 descr: Blackboard Inc 650 Mass Ave, NW Washington, DC 20001 origin: AS22556 mnt-by: MAINT-AS22556 changed: josh [at] blackboard.com 20090108 #19:22:19Z source: RADB route: 216.200.110.0/24 descr: Blackboard Inc 650 Mass Ave, NW Washington, DC 20001 origin: AS22556 mnt-by: MAINT-AS22556 changed: josh [at] blackboard.com 20090108 #19:22:38Z source: RADB route: 216.200.111.0/24 descr: Blackboard Inc 650 Mass Ave, NW Washington, DC 20001 origin: AS22556 mnt-by: MAINT-AS22556 changed: josh [at] blackboard.com 20090108 #19:23:13Z source: RADB route: 216.200.113.0/24 descr: Blackboard Inc 650 Mass Ave, NW Washington, DC 20001 origin: AS22556 mnt-by: MAINT-AS22556 changed: josh [at] blackboard.com 20090108 #19:23:28Z source: RADB route: 82.98.240.0/23 descr: Blackboard Inc 650 Mass Ave, NW Washington, DC 20001 origin: AS22556 mnt-by: MAINT-AS22556 changed: josh [at] blackboard.com 20090108 #19:23:47Z source: RADB route: 82.98.240.0/24 descr: Blackboard Inc 650 Mass Ave, NW Washington, DC 20001 origin: AS22556 mnt-by: MAINT-AS22556 changed: josh [at] blackboard.com 20090108 #19:24:08Z source: RADB route: 82.98.241.0/24 descr: Blackboard Inc 650 Mass Ave, NW Washington, DC 20001 origin: AS22556 mnt-by: MAINT-AS22556 changed: josh [at] blackboard.com 20090108 #19:24:29Z source: RADB route: 204.89.249.0/24 descr: Blackboard Inc 650 Mass Ave, NW Washington, DC 20001 origin: AS22556 mnt-by: MAINT-ASAARNET mnt-by: MAINT-AS22556 changed: nobody [at] aarnet.edu.au 20090108 source: RADB route: 202.167.229.0/24 descr: Blackboard Inc 650 Mass Ave, NW Washington, DC 20001 origin: AS22556 mnt-by: MAINT-AS22556 changed: josh [at] blackboard.com 20090108 #19:42:08Z source: RADB route: 69.196.224.0/19 descr: Blackboard Inc 650 Mass Ave, NW Washington, DC 20001 origin: AS22556 mnt-by: MAINT-AS22556 changed: josh [at] blackboard.com 20090531 #17:14:14Z source: RADB route: 192.230.224.0/20 descr: Blackboard Inc 650 Mass Ave, NW Washington, DC 20001 origin: AS22556 mnt-by: MAINT-AS22556 changed: josh [at] blackboard.com 20130510 #19:32:38Z source: RADB