NumberResearchRecent prefix assignments
357 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
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Dec 2025
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Oct 2025
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2022-08-08 | 753-726 | not yet reported which blocks → | Fibernetics Corporation | 464D | Portland | — |
| 2022-08-08 | 753-727 | not yet reported which blocks → | Fibernetics Corporation | 464D | Toledo | — |
| 2022-08-08 | 878-261 | 2XXX6XXX7XXX8XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | FREEPORT | PA |
| 2022-08-08 | 939-356 | 0–9 XXXwhole prefix which blocks → | SUNCOM DBA T-MOBILE USA | 8645 | MANATI | PR |
| 2022-08-08 | 943-203 | 0–9 XXXall 10 · 7 holders which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | ATLANTA | GA |
| 2022-08-08 | 947-813 | 0–9 XXXall 10 · 5 holders which blocks → | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | NORTHVILLE | MI |
| 2022-08-05 | 224-474 | 0–9 XXXwhole prefix which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | DESPLAINES | IL |
| 2022-08-05 | 240-943 | 0XXX2XXX9XXX · 3 holders which blocks → | COMCAST IP PHONE, LLC | 318J | FROSTBURG | MD |
| 2022-08-05 | 251-399 | 0–9 XXXall 10 · 4 holders which blocks → | ONVOY, LLC - AL | 604E | EVERGREEN | AL |
| 2022-08-05 | 251-403 | 0–9 XXXall 10 · 3 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | FOLEY | AL |
| 2022-08-05 | 254-341 | 0XXX9XXX · 2 holders which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | ITASCA | TX |
| 2022-08-05 | 254-443 | 0XXX1XXX2XXX3XXX9XXX · 4 holders which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | GLEN ROSE | TX |
| 2022-08-05 | 302-618 | 0–9 XXXall 10 · 3 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | NEW CASTLE | DE |
| 2022-08-05 | 332-268 | 0–9 XXXwhole prefix which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY | 6959 | NWYRCYZN01 | NY |
| 2022-08-05 | 413-484 | 0–9 XXXall 10 · 3 holders which blocks → | ONVOY, LLC - MA | 892D | PALMER | MA |
| 2022-08-05 | 682-381 | 0–9 XXXwhole prefix which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX | 6506 | ARLINGTON | TX |
| 2022-08-05 | 762-314 | 0–9 XXXall 10 · 2 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | ROME | GA |
| 2022-08-05 | 826-203 | 0–9 XXXall 10 · 3 holders which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | CHANCELLOR | VA |
| 2022-08-05 | 872-316 | 0–9 XXXall 10 · 3 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | CHICGOZN07 | IL |
| 2022-08-05 | 915-310 | 0XXX9XXX · 2 holders which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | DESERT HVN | TX |
| 2022-08-05 | 945-263 | 3XXX9XXX · 2 holders which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | BARDWELL | TX |
| 2022-08-05 | 951-614 | 0–9 XXXall 10 · 4 holders which blocks → | ONVOY, LLC - CA | 649C | ELSINORE | CA |
| 2022-08-04 | 380-252 | 0–9 XXXall 10 · 3 holders which blocks → | BANDWIDTH.COM CLEC, LLC - OH | 001F | WESTERVL | OH |
| 2022-08-04 | 509-425 | 0–9 XXXall 10 · 3 holders which blocks → | HD CARRIER LLC | 321J | SPOKANE | WA |
| 2022-08-04 | 515-912 | 0–9 XXXall 10 · 5 holders which blocks → | BANDWIDTH.COM CLEC, LLC - IA | 985E | INDIANOLA | IA |
| 2022-08-04 | 531-288 | 0XXX1XXX2XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | MADISON | NE |
| 2022-08-04 | 548-639 | not yet reported which blocks → | Iristel Inc. | 154E | Belmont | — |
| 2022-08-04 | 639-446 | not yet reported which blocks → | Fibernetics Corporation | 464D | Dinsmore | — |
| 2022-08-04 | 639-447 | not yet reported which blocks → | Fibernetics Corporation | 464D | Lanigan | — |
| 2022-08-04 | 639-448 | not yet reported which blocks → | Fibernetics Corporation | 464D | Lucky Lake | — |
| 2022-08-04 | 639-451 | not yet reported which blocks → | Fibernetics Corporation | 464D | Wakaw | — |
| 2022-08-04 | 639-452 | not yet reported which blocks → | Fibernetics Corporation | 464D | Waldheim | — |
| 2022-08-04 | 639-453 | not yet reported which blocks → | Fibernetics Corporation | 464D | Borden | — |
| 2022-08-04 | 639-454 | not yet reported which blocks → | Fibernetics Corporation | 464D | Bruno | — |
| 2022-08-04 | 640-230 | 0–9 XXXall 10 · 3 holders which blocks → | OMNIPOINT COMMUNICATIONS ENTERPRISES, LP | 6626 | PRINCETON | NJ |
| 2022-08-04 | 754-291 | 0–9 XXXall 10 · 4 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | DEERFLDBCH | FL |
| 2022-08-04 | 839-218 | 0–9 XXXall 10 · 3 holders which blocks → | HD CARRIER LLC | 321J | COLUMBIA | SC |
| 2022-08-04 | 870-903 | 7XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - AR | 5179 | FULTON | AR |
| 2022-08-03 | 240-941 | 0–9 XXXall 10 · 3 holders which blocks → | BANDWIDTH.COM CLEC, LLC - MD | 071F | WSHNGTNZN2 | MD |
| 2022-08-03 | 463-277 | 0–9 XXXall 10 · 4 holders which blocks → | BANDWIDTH.COM CLEC, LLC - IN | 105F | GREENWOOD | IN |
| 2022-08-03 | 636-241 | 0–9 XXXall 10 · 2 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO | 5814 | WASHINGTON | MO |
| 2022-08-03 | 667-409 | 0–9 XXXall 10 · 5 holders which blocks → | BANDWIDTH.COM CLEC, LLC - MD | 071F | PARKVILLE | MD |
| 2022-08-03 | 901-673 | 0–9 XXXall 10 · 4 holders which blocks → | COMCAST IP PHONE, LLC | 318J | COLLIERVL | TN |
| 2022-08-03 | 934-232 | 0–9 XXXall 10 · 3 holders which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | ATLANTIC | NY |
| 2022-08-02 | 234-354 | 0–9 XXXall 10 · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - OH | 4863 | MILLERSBG | OH |
| 2022-08-02 | 309-914 | none assigned yet which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | PLYMOUTH | IL |
| 2022-08-02 | 380-250 | 0–9 XXXall 10 · 3 holders which blocks → | AERIAL COMMUNICATIONS, INC. | 6701 | DUBLIN | OH |
| 2022-08-02 | 380-251 | 0–9 XXXall 10 · 2 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - OH | 7532 | COLUMBUS | OH |
| 2022-08-02 | 437-438 | not yet reported which blocks → | Videotron Ltd. | 787G | Toronto | — |
| 2022-08-02 | 509-920 | 0XXX6XXX9XXX · 3 holders which blocks → | BOOST SUBSCRIBERCO L.L.C. | 490J | CHEWELAH | WA |
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.