12.0.0.0 - 12.255.255.255 AT&T ITS (NET-ATT) 12.96.88.0 - 12.96.88.255 Hanover Direct (NETBLK-HANOVER-88) 12.96.89.0 - 12.96.89.255 Hanover Direct (NETBLK-HANOVER-89) 12.96.90.0 - 12.96.90.255 I-Tech, Inc. (NETBLK-ITECH-90) 12.96.91.0 - 12.96.91.255 FAX2NET (NETBLK-FAX2NET-91)