# AS17225 (ATT-CERFNET-BLOCK) # AT&T Enhanced Network Services # 12.130.0.0/18 134.24.173.0/24 134.24.236.0/22 135.12.0.0/21 149.17.208.0/20 199.107.224.0/21 206.16.88.0/23 206.16.144.0/20 206.17.96.0/20 206.19.40.0/21 206.19.48.0/20