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| npa-nxx | State | Company | FRN | RMD | OCN | Rate Center | CLLI | Assign Date | Misc |
| 815-421 | IL | ILLINOIS BELL TEL CO (AT&T) | N/A | 9329 | HERSCHER | HRSCILHRRS1 | 00/00/0000 | Prefix Type: RBOC Switch Name: HERSCHER Switch Type: N/A LATA: Chicago IL METRO (358) Tandem: JOLTILJO20T 🔧 Explore Switch(CLLI: HRSCILHRRS1)) | |
| 815-421 is split into 1,000-number blocks - detail below | |||||||||
| 815-421-0XXX | IL | ILLINOIS BELL TEL CO (AT&T) | N/A | 9329 | HERSCHER | HRSCILHRRS1 | N/A | Prefix Type: RBOC Switch Name: HERSCHER Switch Type: N/A LATA: Chicago IL METRO (358) Tandem: JOLTILJO20T 🔧 Explore Switch(CLLI: HRSCILHRRS1)) | |
| 815-426 | IL | ILLINOIS BELL TEL CO (AT&T) | N/A | 9329 | HERSCHER | HRSCILHRRS1 | 00/00/0000 | Prefix Type: RBOC Switch Name: HERSCHER Switch Type: N/A LATA: Chicago IL METRO (358) Tandem: JOLTILJO20T 🔧 Explore Switch(CLLI: HRSCILHRRS1)) | |
| 815-426 is split into 1,000-number blocks - detail below | |||||||||
| 815-426-2XXX | IL | ILLINOIS BELL TEL CO (AT&T) | N/A | 9329 | HERSCHER | HRSCILHRRS1 | N/A | Prefix Type: RBOC Switch Name: HERSCHER Switch Type: N/A LATA: Chicago IL METRO (358) Tandem: JOLTILJO20T 🔧 Explore Switch(CLLI: HRSCILHRRS1)) | |
| 815-426-6XXX | IL | ILLINOIS BELL TEL CO (AT&T) | N/A | 9329 | HERSCHER | HRSCILHRRS1 | N/A | Prefix Type: RBOC Switch Name: HERSCHER Switch Type: N/A LATA: Chicago IL METRO (358) Tandem: JOLTILJO20T 🔧 Explore Switch(CLLI: HRSCILHRRS1)) |