NumberResearchRecent prefix assignments
338 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/23/2026
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
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2004-08-05 | 505-404 | 0–9 XXXall 10 · 7 holders which blocks → | LEVEL 3 TELECOM OF NEW MEXICO, LLC - NM | 7457 | ALBUQURQUE | NM |
| 2004-08-05 | 575-403 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | TUCUMCARI | NM |
| 2004-08-05 | 575-607 | none assigned yet which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | PORTALES | NM |
| 2004-08-05 | 778-391 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Whalley | — |
| 2004-08-05 | 905-418 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Thornhill | — |
| 2004-08-05 | 905-917 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Unionville | — |
| 2004-08-04 | 406-451 | 0–9 XXXall 10 · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | BOZEMAN | MT |
| 2004-08-04 | 617-938 | 0–9 XXXall 10 · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | BOSTON | MA |
| 2004-08-04 | 619-207 | 0–9 XXXall 10 · 5 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | CHULAVISTA | CA |
| 2004-08-04 | 660-998 | 0–9 XXXall 10 · 2 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | MOBERLY | MO |
| 2004-08-04 | 843-312 | 0–9 XXXall 10 · 2 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SC | 6398 | MONCKS COR | SC |
| 2004-08-04 | 901-209 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | MOSCOW | TN |
| 2004-08-04 | 951-760 | 0–9 XXXall 10 · 4 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TEMECULA | CA |
| 2004-08-03 | 204-201 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Winnipeg | — |
| 2004-08-03 | 239-214 | 0–9 XXXall 10 · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - FL | 4802 | CAPE CORAL | FL |
| 2004-08-03 | 250-410 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Victoria | — |
| 2004-08-03 | 256-640 | 0–9 XXXall 10 · 3 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL | 6804 | ARAB | AL |
| 2004-08-03 | 406-218 | 0–9 XXXall 10 · 6 holders which blocks → | T-MOBILE USA, INC. | 6529 | MISSOULA | MT |
| 2004-08-03 | 418-425 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Quebec | — |
| 2004-08-03 | 585-301 | 0–9 XXXall 10 · 4 holders which blocks → | PAETEC ITEL, LLC | 829J | ROCHESTER | NY |
| 2004-08-03 | 734-303 | 0–9 XXXwhole prefix which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | NEW BOSTON | MI |
| 2004-08-03 | 734-435 | 0–9 XXXwhole prefix which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | NEW BOSTON | MI |
| 2004-08-03 | 778-234 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Richmond | — |
| 2004-08-03 | 778-372 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Vancouver | — |
| 2004-08-03 | 905-225 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | St. Catharines-Thorold | — |
| 2004-08-03 | 905-412 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Streetsville | — |
| 2004-08-02 | 260-399 | 0–9 XXXall 10 · 4 holders which blocks → | PAETEC ITEL, LLC | 829J | FORT WAYNE | IN |
| 2004-08-02 | 469-826 | 0–9 XXXwhole prefix which blocks → | T-MOBILE USA, INC. | 6529 | GRANDPRARI | TX |
| 2004-08-02 | 806-326 | not yet reported which blocks → | AMA COMM., LLC DBA AMA*TECHTEL COMMUNICATIONS-TX | 0132 | AMARILLO | TX |
| 2004-08-02 | 812-571 | 0–9 XXXall 10 · 2 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN | 6725 | CROSS PL | IN |
| 2004-08-02 | 812-907 | 0XXX1XXX which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN | 6725 | MOORESHILL | IN |
| 2004-08-02 | 972-358 | 0–9 XXXwhole prefix which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX | 6506 | GRANDPRARI | TX |
| 2004-07-30 | 330-960 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → | SUPER-NET, INC. - OH | 155F | ORRVILLE | OH |
| 2004-07-30 | 450-557 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Pont-Viau | — |
| 2004-07-30 | 514-375 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Montreal | — |
| 2004-07-30 | 519-286 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | London | — |
| 2004-07-30 | 519-340 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Kitchener-Waterloo | — |
| 2004-07-30 | 519-947 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Preston | — |
| 2004-07-30 | 613-691 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Ottawa-Hull | — |
| 2004-07-30 | 651-394 | 1XXX2XXX7XXX8XXX · 3 holders which blocks → | ONVOY, LLC - MN | 184D | RED WING | MN |
| 2004-07-30 | 701-578 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - ND | 6568 | MINOT | ND |
| 2004-07-30 | 740-440 | 2XXX3XXX4XXX8XXX · 2 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH | 6025 | LTLHOCKING | OH |
| 2004-07-30 | 740-510 | 1XXX2XXX4XXX7XXX8XXX9XXX · 6 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH | 6025 | FAIRVIEW | OH |
| 2004-07-30 | 778-262 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | North Vancouver | — |
| 2004-07-30 | 778-312 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | New Westminster | — |
| 2004-07-30 | 778-612 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Newton | — |
| 2004-07-30 | 813-372 | 0–9 XXXwhole prefix which blocks → | FRONTIER FLORIDA LLC DBA FRONTIER COMM OF FLORIDA | 0328 | TAMPACEN | FL |
| 2004-07-30 | 905-215 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Oshawa | — |
| 2004-07-30 | 905-234 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Malton | — |
| 2004-07-29 | 276-202 | 0–9 XXXwhole prefix which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA | 6827 | RICHLANDS | VA |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/23/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.