npa-nxx | State | Company | OCN | Rate Center | CLLI | Assign Date | Misc |
281-331 | TX | SOUTHWESTERN BELL | 9533 | ALVIN | ALVNTXALDS0 | 00/00/0000 | Prefix Type: RBOC Switch Name: ALVIN Switch Type: Northern Telecom DMS100 (Digital) Host LATA: Houston TX (560) Tandem: N/A Detailed Switch Info |