npa-nxx | State | Company | OCN | Rate Center | CLLI | Assign Date | Misc |
312-591 | IL | ILLINOIS BELL TEL CO (AT&T) | 9329 | CHICGOZN01 | CHCGILWB55T | 00/00/0000 | Prefix Type: RBOC Switch Name: CHCZ 1 Switch Type: N/A LATA: Chicago IL METRO (358) Tandem: N/A Detailed Switch Info |