NumberResearchRecent prefix assignments
334 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/27/2026
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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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 |
|---|---|---|---|---|---|---|
| 2005-10-05 | 505-608 | 0–9 XXXall 10 · 7 holders which blocks → | T-MOBILE USA, INC. | 6529 | FARMINGTON | NM |
| 2005-10-05 | 514-433 | not yet reported which blocks → | Bell Mobility | 6574 | Montreal | — |
| 2005-10-05 | 514-543 | not yet reported which blocks → | Videotron Ltd. | 8306 | Montreal | — |
| 2005-10-05 | 519-390 | not yet reported which blocks → | Rogers Communications Canada Inc. (Cable) | 743B | New Hamburg | — |
| 2005-10-05 | 519-391 | not yet reported which blocks → | Rogers Communications Canada Inc. (Cable) | 743B | New Dundee | — |
| 2005-10-05 | 519-394 | not yet reported which blocks → | Rogers Communications Canada Inc. (Cable) | 743B | Ayr | — |
| 2005-10-05 | 519-400 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Guelph | — |
| 2005-10-05 | 519-500 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Kitchener-Waterloo | — |
| 2005-10-05 | 575-805 | 0–9 XXXwhole prefix which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | LAS CRUCES | NM |
| 2005-10-05 | 631-638 | 0–9 XXXall 10 · 4 holders which blocks → | VERIZON NEW YORK, INC. | 9104 | STONYBROOK | NY |
| 2005-10-05 | 647-237 | not yet reported which blocks → | Bell Mobility | 6574 | Toronto | — |
| 2005-10-05 | 647-340 | not yet reported which blocks → | Rogers Communications Canada Inc. (Cable) | 743B | Toronto | — |
| 2005-10-05 | 647-405 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Toronto | — |
| 2005-10-05 | 647-406 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Toronto | — |
| 2005-10-05 | 647-408 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Toronto | — |
| 2005-10-05 | 678-914 | 0–9 XXXwhole prefix which blocks → | METROPCS, INC. | 5562 | ATLANTA NE | GA |
| 2005-10-05 | 724-905 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | CLYMER | PA |
| 2005-10-05 | 724-915 | 0–9 XXXall 10 · 8 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | HOMER CITY | PA |
| 2005-10-05 | 865-233 | 0–9 XXXall 10 · 3 holders which blocks → | CHARTER IP ENABLED SERVICES, LLC | 792K | MARYVILLE | TN |
| 2005-10-05 | 902-402 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Halifax | — |
| 2005-10-05 | 920-508 | 8XXX which blocks → | METRO SOUTHWEST PCS, LLP | 9759 | WEYAUWEGA | WI |
| 2005-10-04 | 317-300 | 0–9 XXXall 10 · 5 holders which blocks → | COMCAST IP PHONE, LLC | 318J | GREENWOOD | IN |
| 2005-10-04 | 541-320 | 0–9 XXXall 10 · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - OR | 3234 | SUMPTER | OR |
| 2005-10-04 | 715-650 | 9XXX which blocks → | METRO SOUTHWEST PCS, LLP | 9759 | MARSHFIELD | WI |
| 2005-10-04 | 715-707 | 5XXX6XXX8XXX9XXX · 2 holders which blocks → | METRO SOUTHWEST PCS, LLP | 9759 | IOLA | WI |
| 2005-10-04 | 915-694 | 0–9 XXXwhole prefix which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | EL PASO | TX |
| 2005-10-04 | 920-340 | 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | METRO SOUTHWEST PCS, LLP | 9759 | CHILTON | WI |
| 2005-10-03 | 410-710 | 0–9 XXXall 10 · 2 holders which blocks → | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | 6855 | BALTIMORE | MD |
| 2005-10-03 | 541-505 | 0–9 XXXall 10 · 5 holders which blocks → | ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM | 7172 | EUGENE | OR |
| 2005-10-03 | 786-768 | 0–9 XXXall 10 · 2 holders which blocks → | IDT AMERICA CORP. - FL | 765A | MIAMI | FL |
| 2005-10-03 | 909-653 | 0–9 XXXall 10 · 6 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | COLTON | CA |
| 2005-10-03 | 909-907 | 0–9 XXXall 10 · 8 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HIGHLAND | CA |
| 2005-09-30 | 209-228 | 0–9 XXXwhole prefix which blocks → | PACIFIC BELL | 9740 | MERCED | CA |
| 2005-09-30 | 308-765 | 3XXX4XXX5XXX6XXX7XXX which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NE | 5807 | SCOTSBLUFF | NE |
| 2005-09-30 | 410-814 | 0–9 XXXall 10 · 3 holders which blocks → | PAETEC ITEL, LLC | 829J | BALTIMORE | MD |
| 2005-09-30 | 520-309 | 0–9 XXXall 10 · 4 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TUCSON | AZ |
| 2005-09-30 | 662-882 | 0–9 XXXall 10 · 4 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | RIPLEY | MS |
| 2005-09-30 | 773-701 | 0–9 XXXall 10 · 4 holders which blocks → | T-MOBILE USA, INC. | 6529 | CHICGOZN10 | IL |
| 2005-09-30 | 773-954 | 0–9 XXXwhole prefix which blocks → | T-MOBILE USA, INC. | 6529 | CHICGOZN10 | IL |
| 2005-09-30 | 909-922 | 0–9 XXXall 10 · 9 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ETIWANDA | CA |
| 2005-09-30 | 916-647 | 0–9 XXXall 10 · 6 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ELK GROVE | CA |
| 2005-09-29 | 310-294 | 0–9 XXXall 10 · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | TORRANCE | CA |
| 2005-09-29 | 310-295 | 0–9 XXXall 10 · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | W ANGELES | CA |
| 2005-09-29 | 310-425 | 0–9 XXXall 10 · 7 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CULVERCITY | CA |
| 2005-09-29 | 480-728 | 0–9 XXXwhole prefix which blocks → | QWEST CORPORATION | 9636 | PHOENIX | AZ |
| 2005-09-29 | 620-313 | 1XXX2XXX3XXX8XXX · 2 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - KS | 6532 | LIBERTY | KS |
| 2005-09-29 | 787-901 | 0–9 XXXwhole prefix which blocks → | SUNCOM DBA T-MOBILE USA | 8645 | PONCE | PR |
| 2005-09-28 | 479-305 | 4XXX5XXX6XXX7XXX which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR | 6805 | FAYETTEVL | AR |
| 2005-09-28 | 515-326 | 0–9 XXXall 10 · 2 holders which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| 2005-09-28 | 702-738 | 0–9 XXXall 10 · 2 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | LAS VEGAS | NV |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/27/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.