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| npa-nxx | State/Province | Company | FRN | RMD | OCN | Rate Center | CLLI | Assign Date | Misc |
| 918-668 | OK | CENTRAL OKLAHOMA TELEPHONE CO., L.L.C. | 0001700905 | RMD0002619 | 1977 | CASTLE | CSTLOKXARL1 | 00/00/0000 | Prefix Type: ICO Switch Name: CASTLE Switch Type: Northern Telecom DMS10 RLCM LATA: Tulsa OK (538) Tandem: N/A 🔧 Explore Switch(CLLI: CSTLOKXARL1)) |