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| npa-nxx | State | Company | OCN | Rate Center | CLLI | Assign Date | Misc |
| 779-232 | IL | TELEPORT COMMUNICATIONS AMERICA, LLC - IL (AT&T) | 7136 | WILMINGTON | OKBRILOAXEX | 06/07/2007 | Prefix Type: CLEC Switch Name: OAK BROOK Switch Type: N/A LATA: N/A Tandem: N/A Detailed Switch Info |
| 779-257 | IL | BANDWIDTH.COM CLEC, LLC - IL | 984E | WILMINGTON | CHCGILWBXDZ | 07/11/2018 | Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: N/A Tandem: N/A Detailed Switch Info |
| 779-429 | IL | AT&T CORP. (AT&T) | 516C | WILMINGTON | CHCGILCLXOX | 11/13/2008 | Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: N/A Tandem: N/A Detailed Switch Info |
| 815-476 | IL | ILLINOIS BELL TEL CO (AT&T) | 9329 | WILMINGTON | WLMGILWMRS0 | 00/00/0000 | Prefix Type: RBOC Switch Name: WILMINGTON Switch Type: N/A LATA: N/A Tandem: JOLTILJO20T Detailed Switch Info |
| 815-926 | IL | LEVEL 3 COMMUNICATIONS, LLC - IL (Lumen Technologies, Inc) | 6115 | WILMINGTON | CHCGILGMDS7 | 05/22/2001 | Prefix Type: CLEC Switch Name: CHICAGO Switch Type: N/A LATA: N/A Tandem: N/A Detailed Switch Info |