ARIN: WHOIS Database Search

AT&T WorldNet Services ATT (NET-12-0-0-0-1) 
                                  12.0.0.0 - 12.255.255.255
AlixPartners ALIXPART1-96 (NET-12-47-64-96-1) 
                                  12.47.64.96 - 12.47.64.127

# ARIN WHOIS database, last updated 2009-11-20 20:00
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ARIN WHOIS Database Search