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
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 |
|---|---|---|---|---|---|---|
| 2005-07-11 | 423-548 | not yet reported which blocks → | ETC COMMUNICATIONS, L.L.C. - TN | 566D | COPPERBSIN | TN |
| 2005-07-11 | 845-837 | 0–9 XXXall 10 · 5 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | MONROE | NY |
| 2005-07-09 | 412-735 | 0–9 XXXall 10 · 2 holders which blocks → | CITYNET PENNSYLVANIA, LLC - PA | 657B | PTTSBGZON1 | PA |
| 2005-07-09 | 630-386 | 0–9 XXXall 10 · 4 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | W CHICAGO | IL |
| 2005-07-09 | 724-833 | 0–9 XXXall 10 · 2 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA | 6392 | WAYNESBURG | PA |
| 2005-07-07 | 218-595 | 0–9 XXXall 10 · 6 holders which blocks → | ONVOY, LLC - MN | 184D | TWOHARBORS | MN |
| 2005-07-07 | 702-508 | 0–9 XXXall 10 · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NV | 4805 | MTCHARLETN | NV |
| 2005-07-07 | 775-909 | 0–9 XXXall 10 · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NV | 4805 | SILVER SPG | NV |
| 2005-07-07 | 828-554 | 0–9 XXXall 10 · 7 holders which blocks → | FRONTIER COMMUNICATIONS OF THE CAROLINAS INC. - NC | 0509 | CHEROKEE | NC |
| 2005-07-06 | 248-793 | 0–9 XXXall 10 · 6 holders which blocks → | 123.NET, LLC | 2550 | ORTONVILLE | MI |
| 2005-07-06 | 443-954 | 0–9 XXXwhole prefix which blocks → | PAETEC ITEL, LLC | 829J | BALTIMORE | MD |
| 2005-07-06 | 601-889 | 7XXX which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | PICAYUNE | MS |
| 2005-07-06 | 662-858 | 3XXX7XXX8XXX · 2 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MS | 6396 | WINONA | MS |
| 2005-07-06 | 702-688 | 0–9 XXXall 10 · 4 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC | 6010 | LAS VEGAS | NV |
| 2005-07-06 | 865-896 | 0–9 XXXall 10 · 8 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | SOLWAY | TN |
| 2005-07-05 | 501-530 | 2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR | 6805 | BALD KNOB | AR |
| 2005-07-01 | 315-503 | 0–9 XXXall 10 · 4 holders which blocks → | LEVEL 3 TELECOM OF NEW YORK, LP - NY | 8473 | MINOA | NY |
| 2005-07-01 | 330-301 | 0–9 XXXwhole prefix which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH | 6025 | YOUNGSTOWN | OH |
| 2005-07-01 | 406-440 | 2XXX5XXX6XXX7XXX · 3 holders which blocks → | 3 RIVERS TELEPHONE COOPERATIVE, INC. - MT | 3924 | HELENA | MT |
| 2005-07-01 | 423-465 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | NEWPORT | TN |
| 2005-07-01 | 484-264 | 0–9 XXXall 10 · 2 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | ALLENTOWN | PA |
| 2005-07-01 | 567-303 | 0–9 XXXall 10 · 5 holders which blocks → | TIER 2 COMMUNICATIONS, LLC | 8168 | MANSFIELD | OH |
| 2005-07-01 | 615-713 | 0–9 XXXall 10 · 4 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | MURFREESBO | TN |
| 2005-07-01 | 717-405 | 0–9 XXXall 10 · 5 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | LANCASTER | PA |
| 2005-07-01 | 845-891 | 0–9 XXXall 10 · 4 holders which blocks → | WARWICK VALLEY TELEPHONE COMPANY | 4967 | POUGHKEPSI | NY |
| 2005-06-30 | 204-272 | not yet reported which blocks → | GT Group Telecom Services Corp. | 8506 | Winnipeg | — |
| 2005-06-30 | 224-848 | 0XXX1XXX2XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → | T-MOBILE USA, INC. | 6529 | BARRINGTON | IL |
| 2005-06-30 | 250-984 | not yet reported which blocks → | GT Group Telecom Services Corp. | 8506 | Victoria | — |
| 2005-06-30 | 502-407 | 0–9 XXXall 10 · 4 holders which blocks → | POWERTEL KENTUCKY LICENSES, INC. | 365C | LOUISVILLE | KY |
| 2005-06-30 | 514-512 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Montreal | — |
| 2005-06-30 | 514-513 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Montreal | — |
| 2005-06-30 | 514-515 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Montreal | — |
| 2005-06-30 | 514-516 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Montreal | — |
| 2005-06-30 | 519-305 | not yet reported which blocks → | Rogers Communications Canada Inc. (Cable) | 743B | Stratford | — |
| 2005-06-30 | 562-912 | 0–9 XXXall 10 · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | LONG BEACH | CA |
| 2005-06-30 | 618-710 | 0–9 XXXall 10 · 8 holders which blocks → | CHARTER IP ENABLED SERVICES, LLC | 792K | FREEBURG | IL |
| 2005-06-30 | 618-808 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 9 holders which blocks → | CHARTER IP ENABLED SERVICES, LLC | 792K | LEBANON | IL |
| 2005-06-30 | 646-429 | 0–9 XXXall 10 · 5 holders which blocks → | VERIZON NEW YORK, INC. | 9104 | NWYRCYZN01 | NY |
| 2005-06-30 | 773-603 | 0–9 XXXwhole prefix which blocks → | T-MOBILE USA, INC. | 6529 | CHICGOZN10 | IL |
| 2005-06-30 | 773-656 | 0–9 XXXwhole prefix which blocks → | T-MOBILE USA, INC. | 6529 | CHICGOZN10 | IL |
| 2005-06-30 | 778-238 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | New Westminster | — |
| 2005-06-30 | 778-239 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Vancouver | — |
| 2005-06-30 | 909-786 | 0–9 XXXall 10 · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | ONTARIO | CA |
| 2005-06-29 | 201-680 | 0–9 XXXall 10 · 4 holders which blocks → | VERIZON NEW JERSEY, INC. | 9206 | JERSEYCITY | NJ |
| 2005-06-29 | 224-603 | 0–9 XXXall 10 · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | ANTIOCH | IL |
| 2005-06-29 | 318-990 | 0–9 XXXall 10 · 3 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | SHREVEPORT | LA |
| 2005-06-29 | 386-674 | 0XXX1XXX2XXX3XXX6XXX7XXX · 4 holders which blocks → | TERRA NOVA TELECOM, INC. - FL | 382G | FLORAHOME | FL |
| 2005-06-29 | 403-463 | not yet reported which blocks → | Bell Mobility | 6574 | Calgary | — |
| 2005-06-29 | 450-524 | not yet reported which blocks → | Bell Mobility | 6574 | St-Jean | — |
| 2005-06-29 | 514-209 | not yet reported which blocks → | Bell Mobility | 6574 | Montreal | — |
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.