NumberResearchRecent prefix assignments
352 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/25/2026
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
Aug 2026
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Mar 2026
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Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2022-07-13 | 346-573 | 0–9 XXXall 10 · 2 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX | 6506 | CYPRESS | TX |
| 2022-07-13 | 414-373 | 0–9 XXXall 10 · 4 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MILWAUKZN1 | WI |
| 2022-07-13 | 442-387 | 4XXX5XXX which blocks → | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | SALTON | CA |
| 2022-07-13 | 505-526 | 0–9 XXXwhole prefix which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM | 6573 | ALBUQURQUE | NM |
| 2022-07-13 | 534-206 | 4XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - WI | 5489 | BAY CITY | WI |
| 2022-07-13 | 661-649 | 0–9 XXXall 10 · 3 holders which blocks → | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | ARVIN | CA |
| 2022-07-13 | 662-921 | 0XXX6XXX which blocks → | ONVOY, LLC - MS | 719E | ISOLA | MS |
| 2022-07-13 | 662-938 | 0XXX6XXX which blocks → | ONVOY, LLC - MS | 719E | HOLLYBLUFF | MS |
| 2022-07-13 | 681-896 | 0–9 XXXall 10 · 3 holders which blocks → | TWILIO INTERNATIONAL, INC. | 506J | CLARKSBURG | WV |
| 2022-07-13 | 769-288 | 0XXX6XXX8XXX · 2 holders which blocks → | ONVOY, LLC - MS | 719E | BENNDALE | MS |
| 2022-07-13 | 775-495 | 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | GARDNERVL | NV |
| 2022-07-13 | 808-897 | 0–9 XXXall 10 · 2 holders which blocks → | TWILIO INTERNATIONAL, INC. | 506J | HONOLULU | HI |
| 2022-07-13 | 951-612 | 0–9 XXXall 10 · 2 holders which blocks → | ONVOY, LLC - CA | 649C | BANNING | CA |
| 2022-07-12 | 240-935 | 0–9 XXXall 10 · 4 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | 6395 | LAUREL236 | MD |
| 2022-07-12 | 256-954 | 0–9 XXXall 10 · 5 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL | 6804 | ANNISTON | AL |
| 2022-07-12 | 365-267 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Victoria | — |
| 2022-07-12 | 365-296 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Ridgeway | — |
| 2022-07-12 | 365-823 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Bethesda | — |
| 2022-07-12 | 365-824 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Keswick | — |
| 2022-07-12 | 458-269 | 0XXX1XXX7XXX · 3 holders which blocks → | BANDWIDTH.COM CLEC, LLC - OR | 076F | DRAIN | OR |
| 2022-07-12 | 513-224 | 0–9 XXXall 10 · 3 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | LEBANON | OH |
| 2022-07-12 | 516-814 | 0–9 XXXall 10 · 5 holders which blocks → | ONVOY, LLC- NY | 384C | NASSAUZN08 | NY |
| 2022-07-12 | 579-395 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Huntingdon | — |
| 2022-07-12 | 579-396 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Franklin Centre | — |
| 2022-07-12 | 579-397 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Ormstown | — |
| 2022-07-12 | 726-227 | 0–9 XXXwhole prefix which blocks → | ONVOY, LLC - TX | 903C | SANANTONIO | TX |
| 2022-07-12 | 786-875 | 0–9 XXXall 10 · 2 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | PERRINE | FL |
| 2022-07-12 | 786-881 | 0–9 XXXwhole prefix which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | MIAMI | FL |
| 2022-07-12 | 864-807 | 0–9 XXXall 10 · 5 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SC | 6398 | GREENVILLE | SC |
| 2022-07-12 | 914-538 | 0XXX1XXX2XXX3XXX4XXX which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY | 6959 | MAHOPAC | NY |
| 2022-07-12 | 914-814 | 0–9 XXXall 10 · 3 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | CHAPPAQUA | NY |
| 2022-07-11 | 206-804 | 0–9 XXXall 10 · 3 holders which blocks → | ONVOY, LLC - WA | 483E | BAINBDG IS | WA |
| 2022-07-11 | 209-970 | 1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | PLYMOUTH | CA |
| 2022-07-11 | 209-971 | 0–9 XXXall 10 · 4 holders which blocks → | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | MODESTO | CA |
| 2022-07-11 | 249-902 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Buckhorn | — |
| 2022-07-11 | 249-903 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Omemee | — |
| 2022-07-11 | 343-557 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Maynooth | — |
| 2022-07-11 | 343-701 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Seeleys Bay | — |
| 2022-07-11 | 343-702 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Selby | — |
| 2022-07-11 | 442-384 | 0XXX7XXX · 2 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | DESERT CTR | CA |
| 2022-07-11 | 650-658 | 0–9 XXXwhole prefix which blocks → | ONVOY, LLC - CA | 649C | WOODSIDE | CA |
| 2022-07-11 | 707-810 | 0–9 XXXall 10 · 3 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BENICIA | CA |
| 2022-07-08 | 212-814 | 0–9 XXXwhole prefix which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY | 6959 | NWYRCYZN01 | NY |
| 2022-07-08 | 272-293 | 0–9 XXXall 10 · 2 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | CARBONDALE | PA |
| 2022-07-08 | 276-267 | 0–9 XXXwhole prefix which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | NORTON | VA |
| 2022-07-08 | 302-614 | 0–9 XXXwhole prefix which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - DE | 6393 | GEORGETOWN | DE |
| 2022-07-08 | 302-615 | 0–9 XXXall 10 · 4 holders which blocks → | BANDWIDTH.COM CLEC, LLC - DE | 073F | HOLLY OAK | DE |
| 2022-07-08 | 332-264 | 0–9 XXXwhole prefix which blocks → | ONVOY, LLC- NY | 384C | NWYRCYZN01 | NY |
| 2022-07-08 | 341-342 | 0–9 XXXall 10 · 2 holders which blocks → | ONVOY, LLC - CA | 649C | FRNK OLIVR | CA |
| 2022-07-08 | 445-250 | 0–9 XXXwhole prefix which blocks → | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | PHPHSBZN38 | PA |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/25/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.