199.189.0.0 - 199.189.5.0 The Sear-Brown Group, Inc. (NETBLK-TBLK-SBG) 199.189.8.0 - 199.189.15.0 Glenbrook H.S. District #225 (NETBLK-GLENBROOKHS) 199.189.16.0 - 199.189.25.0 The Hospital of the Good Samaritan (NETBLK-TBLK-GOODSAM) 199.189.32.0 - 199.189.61.0 Alverno Adminstrative Services, Inc. (NETBLK-TBLK-SSFHCS)