NumberResearchRecent prefix assignments
358 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/24/2026
The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.
Most active assignees, last 30 days
New assignments by month
Sep 2026
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Oct 2025
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2022-03-31 | 571-578 | 0–9 XXXall 10 · 4 holders which blocks → | METROPCS, INC. | 5562 | LEESBURG | VA |
| 2022-03-31 | 681-426 | 0XXX3XXX · 2 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WV | 6394 | WHSLPHRSPG | WV |
| 2022-03-31 | 681-436 | 0XXX which blocks → | BANDWIDTH.COM CLEC, LLC - WV | 080F | SETH | WV |
| 2022-03-31 | 742-374 | not yet reported which blocks → | FGLTEL Inc. | 139J | King City | — |
| 2022-03-31 | 742-375 | not yet reported which blocks → | FGLTEL Inc. | 139J | Kleinburg | — |
| 2022-03-31 | 742-376 | not yet reported which blocks → | FGLTEL Inc. | 139J | Maple | — |
| 2022-03-31 | 742-377 | not yet reported which blocks → | FGLTEL Inc. | 139J | Markham | — |
| 2022-03-31 | 742-378 | not yet reported which blocks → | FGLTEL Inc. | 139J | Mount Albert | — |
| 2022-03-31 | 742-379 | not yet reported which blocks → | FGLTEL Inc. | 139J | Newmarket | — |
| 2022-03-31 | 742-380 | not yet reported which blocks → | FGLTEL Inc. | 139J | Nobleton | — |
| 2022-03-31 | 742-381 | not yet reported which blocks → | FGLTEL Inc. | 139J | Oak Ridges | — |
| 2022-03-31 | 742-382 | not yet reported which blocks → | FGLTEL Inc. | 139J | Palgrave | — |
| 2022-03-31 | 742-384 | not yet reported which blocks → | FGLTEL Inc. | 139J | Queensville | — |
| 2022-03-31 | 742-386 | not yet reported which blocks → | FGLTEL Inc. | 139J | Schomberg | — |
| 2022-03-31 | 742-387 | not yet reported which blocks → | FGLTEL Inc. | 139J | Stouffville | — |
| 2022-03-31 | 742-388 | not yet reported which blocks → | FGLTEL Inc. | 139J | Sutton | — |
| 2022-03-31 | 742-389 | not yet reported which blocks → | FGLTEL Inc. | 139J | Thornhill | — |
| 2022-03-31 | 742-391 | not yet reported which blocks → | FGLTEL Inc. | 139J | Unionville | — |
| 2022-03-31 | 742-392 | not yet reported which blocks → | FGLTEL Inc. | 139J | Uxbridge | — |
| 2022-03-31 | 742-393 | not yet reported which blocks → | FGLTEL Inc. | 139J | Woodbridge | — |
| 2022-03-31 | 743-249 | 0–9 XXXall 10 · 5 holders which blocks → | PAETEC ITEL, LLC | 829J | GREENSBORO | NC |
| 2022-03-31 | 779-353 | 0XXX1XXX3XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | FORRESTON | IL |
| 2022-03-31 | 779-354 | 1XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | DAVIS | IL |
| 2022-03-31 | 779-355 | 1XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | HARMON | IL |
| 2022-03-31 | 980-381 | 0–9 XXXall 10 · 4 holders which blocks → | PAETEC ITEL, LLC | 829J | CHARLOTTE | NC |
| 2022-03-30 | 225-482 | 0XXX2XXX9XXX · 3 holders which blocks → | METROPCS, INC. | 5562 | SORRENTO | LA |
| 2022-03-30 | 225-483 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → | METROPCS, INC. | 5562 | DONALDSNVL | LA |
| 2022-03-30 | 251-552 | 0–9 XXXall 10 · 3 holders which blocks → | ONVOY, LLC - AL | 604E | BAYOUBATRE | AL |
| 2022-03-30 | 251-553 | 0–9 XXXall 10 · 2 holders which blocks → | ONVOY, LLC - AL | 604E | IRNGTNSTEL | AL |
| 2022-03-30 | 251-556 | 4XXX5XXX6XXX which blocks → | ONVOY, LLC - AL | 604E | FINCHBURG | AL |
| 2022-03-30 | 251-557 | 1XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → | ONVOY, LLC - AL | 604E | PETERMAN | AL |
| 2022-03-30 | 276-895 | 0XXX1XXX2XXX3XXX4XXX7XXX8XXX · 3 holders which blocks → | TWILIO INTERNATIONAL, INC. | 506J | BLUEFIELD | VA |
| 2022-03-30 | 320-895 | 0XXX1XXX8XXX9XXX · 2 holders which blocks → | TWILIO INTERNATIONAL, INC. | 506J | ST CLOUD | MN |
| 2022-03-30 | 334-753 | 0–9 XXXall 10 · 2 holders which blocks → | PAETEC ITEL, LLC | 829J | MONTGOMERY | AL |
| 2022-03-30 | 337-568 | 0XXX1XXX2XXX3XXX4XXX8XXX9XXX · 3 holders which blocks → | PAETEC ITEL, LLC | 829J | LAFAYETTE | LA |
| 2022-03-30 | 448-204 | 0–9 XXXall 10 · 3 holders which blocks → | PAETEC ITEL, LLC | 829J | PENSACOLA | FL |
| 2022-03-30 | 582-852 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → | TWILIO INTERNATIONAL, INC. | 506J | ERIE | PA |
| 2022-03-30 | 607-894 | 8XXX which blocks → | TWILIO INTERNATIONAL, INC. | 506J | BINGHAMTON | NY |
| 2022-03-30 | 667-897 | 7XXX8XXX · 2 holders which blocks → | TWILIO INTERNATIONAL, INC. | 506J | CHESAPKECY | MD |
| 2022-03-30 | 672-330 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Vavenby | — |
| 2022-03-30 | 672-331 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Westsyde | — |
| 2022-03-30 | 672-332 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Westwold | — |
| 2022-03-30 | 672-386 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Savona | — |
| 2022-03-30 | 672-387 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Spences Bridge | — |
| 2022-03-30 | 672-647 | not yet reported which blocks → | CityWest Cable (North) Corp - BC | 705F | Port Simpson | — |
| 2022-03-30 | 672-825 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Logan Lake | — |
| 2022-03-30 | 672-900 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | North Kamloops | — |
| 2022-03-30 | 672-901 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Lytton | — |
| 2022-03-30 | 672-902 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Pritchard | — |
| 2022-03-30 | 742-368 | not yet reported which blocks → | FGLTEL Inc. | 139J | Aurora | — |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/24/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.