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| npa-nxx | State | Company | OCN | Rate Center | CLLI | Assign Date | Misc |
| 520-437 | AZ | XO ARIZONA, INC. (Verizon Communications) | 4793 | TUCSON | TCSNAZMAGT0 | 03/30/2006 | Prefix Type: CLEC Switch Name: TUCSON Switch Type: N/A LATA: Tucson AZ (668) Tandem: N/A Detailed Switch Info |
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| 520-437-0 | AZ | XO ARIZONA, INC. (Verizon Communications) | 4793 | TUCSON | TCSNAZMAGT0 | 03/31/2006 | Prefix Type: CLEC Switch Name: TUCSON Switch Type: N/A LATA: Tucson AZ (668) Tandem: N/A Detailed Switch Info |
| 623-398 | AZ | XO ARIZONA, INC. (Verizon Communications) | 4793 | PHOENIX | PHNAAZ55DS0 | 00/00/0000 | Prefix Type: CLEC Switch Name: PHOENIX Switch Type: N/A LATA: Phoenix AZ (666) Tandem: N/A Detailed Switch Info |
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| 623-398-0 | AZ | XO ARIZONA, INC. (Verizon Communications) | 4793 | PHOENIX | PHNAAZ55DS0 | N/A | Prefix Type: CLEC Switch Name: PHOENIX Switch Type: N/A LATA: Phoenix AZ (666) Tandem: N/A Detailed Switch Info |
| 623-398-3 | AZ | XO ARIZONA, INC. (Verizon Communications) | 4793 | PHOENIX | PHNAAZ55DS0 | N/A | Prefix Type: CLEC Switch Name: PHOENIX Switch Type: N/A LATA: Phoenix AZ (666) Tandem: N/A Detailed Switch Info |