NumberResearchRecent prefix assignments
334 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/28/2026
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 |
|---|---|---|---|---|---|---|
| 2016-08-15 | 657-339 | 0–9 XXXall 10 · 3 holders which blocks → | BANDWIDTH.COM CLEC, LLC - CA | 981E | HUNTITNBCH | CA |
| 2016-08-15 | 775-683 | 0–9 XXXall 10 · 4 holders which blocks → | CHARTER IP ENABLED SERVICES, LLC | 792K | RENO | NV |
| 2016-08-15 | 845-317 | 0–9 XXXall 10 · 6 holders which blocks → | BANDWIDTH.COM CLEC, LLC - NY | 997E | MARLBORO | NY |
| 2016-08-15 | 856-259 | 0–9 XXXall 10 · 7 holders which blocks → | BANDWIDTH.COM CLEC, LLC - NJ | 118F | WILLIAMSTN | NJ |
| 2016-08-15 | 862-292 | 0–9 XXXall 10 · 4 holders which blocks → | BANDWIDTH.COM CLEC, LLC - NJ | 118F | VERONA | NJ |
| 2016-08-15 | 929-398 | 0–9 XXXall 10 · 3 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY | 7133 | NWYRCYZN10 | NY |
| 2016-08-15 | 929-425 | 0–9 XXXall 10 · 5 holders which blocks → | BANDWIDTH.COM CLEC, LLC - NY | 997E | NWYRCYZN14 | NY |
| 2016-08-15 | 929-443 | 0–9 XXXall 10 · 3 holders which blocks → | BANDWIDTH.COM CLEC, LLC - NY | 997E | NWYRCYZN12 | NY |
| 2016-08-15 | 940-313 | 3XXX6XXX9XXX · 3 holders which blocks → | VALOR TELECOMM TX, LP-TX #1 DBA WINDSTREAM COMM SW | 1163 | MUNDAY | TX |
| 2016-08-15 | 940-316 | 1XXX6XXX9XXX · 3 holders which blocks → | VALOR TELECOMM TX, LP-TX #1 DBA WINDSTREAM COMM SW | 1163 | KNOX CITY | TX |
| 2016-08-15 | 940-401 | 1XXX2XXX4XXX9XXX · 2 holders which blocks → | VALOR TELECOMM TX, LP-TX #1 DBA WINDSTREAM COMM SW | 1163 | HOLLIDAY | TX |
| 2016-08-15 | 940-402 | 1XXX9XXX · 2 holders which blocks → | VALOR TELECOMM TX, LP-TX #1 DBA WINDSTREAM COMM SW | 1163 | HASKELL | TX |
| 2016-08-15 | 951-414 | 0–9 XXXall 10 · 6 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | TEMECULA | CA |
| 2016-08-15 | 971-432 | 0–9 XXXall 10 · 7 holders which blocks → | T-MOBILE USA, INC. | 6529 | WOODBURN | OR |
| 2016-08-15 | 985-551 | 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - LA | 6505 | HAMMOND | LA |
| 2016-08-12 | 207-261 | 0XXX1XXX2XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - ME | 882G | MILLINOCKT | ME |
| 2016-08-12 | 312-414 | 0–9 XXXall 10 · 5 holders which blocks → | VONAGE AMERICA LLC | 197D | CHICGOZN01 | IL |
| 2016-08-12 | 334-802 | 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | BANDWIDTH.COM CLEC, LLC - AL | 072F | HURTSBORO | AL |
| 2016-08-12 | 414-252 | 0–9 XXXall 10 · 4 holders which blocks → | AT&T ENTERPRISES, LLC | 516C | MILWAUKZN1 | WI |
| 2016-08-12 | 442-207 | 0–9 XXXall 10 · 4 holders which blocks → | BANDWIDTH.COM CLEC, LLC - CA | 981E | FALLBROOK | CA |
| 2016-08-12 | 470-351 | 0–9 XXXall 10 · 2 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - GA | 7435 | ATLANTA | GA |
| 2016-08-12 | 470-598 | 0–9 XXXall 10 · 5 holders which blocks → | BANDWIDTH.COM CLEC, LLC - GA | 983E | ROCKMART | GA |
| 2016-08-12 | 502-450 | 0–9 XXXall 10 · 4 holders which blocks → | AT&T ENTERPRISES, LLC | 516C | LOUISVILLE | KY |
| 2016-08-12 | 515-552 | 0–9 XXXall 10 · 7 holders which blocks → | UNITED STATES CELLULAR - IA | 6266 | INDIANOLA | IA |
| 2016-08-12 | 619-404 | 0–9 XXXall 10 · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | EL CAJON | CA |
| 2016-08-12 | 660-858 | 0XXX1XXX5XXX8XXX9XXX · 5 holders which blocks → | WINDSTREAM MISSOURI, INC. | 1885 | FLORENCE | MO |
| 2016-08-12 | 747-257 | 0–9 XXXall 10 · 5 holders which blocks → | T-MOBILE USA, INC. | 6529 | GLENDALE | CA |
| 2016-08-12 | 802-397 | 0–9 XXXall 10 · 7 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | ST JOHNSBY | VT |
| 2016-08-12 | 805-554 | 0–9 XXXall 10 · 6 holders which blocks → | T-MOBILE USA, INC. | 6529 | SANTAMARIA | CA |
| 2016-08-12 | 857-410 | 0–9 XXXall 10 · 6 holders which blocks → | BANDWIDTH.COM CLEC, LLC - MA | 990E | CHARLESTN | MA |
| 2016-08-12 | 912-274 | 0–9 XXXall 10 · 5 holders which blocks → | BANDWIDTH.COM CLEC, LLC - GA | 983E | LYONS | GA |
| 2016-08-12 | 949-405 | 0–9 XXXwhole prefix which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | IRVINE | CA |
| 2016-08-11 | 253-287 | 0–9 XXXall 10 · 4 holders which blocks → | T-MOBILE USA, INC. | 6529 | TACOMA | WA |
| 2016-08-11 | 437-991 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Toronto | — |
| 2016-08-11 | 437-992 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Toronto | — |
| 2016-08-11 | 437-993 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Toronto | — |
| 2016-08-11 | 437-994 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Toronto | — |
| 2016-08-11 | 437-995 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Toronto | — |
| 2016-08-11 | 437-996 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Toronto | — |
| 2016-08-11 | 437-997 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Toronto | — |
| 2016-08-11 | 437-998 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Toronto | — |
| 2016-08-11 | 712-532 | 0–9 XXXall 10 · 3 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH | 1167 | EMMETSBURG | IA |
| 2016-08-10 | 206-698 | 0–9 XXXall 10 · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | SEATTLE | WA |
| 2016-08-10 | 365-889 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Hamilton | — |
| 2016-08-10 | 484-587 | 0–9 XXXall 10 · 5 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | POTTSTOWN | PA |
| 2016-08-10 | 548-882 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Brantford | — |
| 2016-08-10 | 548-886 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Chatham | — |
| 2016-08-10 | 548-888 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | London | — |
| 2016-08-10 | 717-804 | 0–9 XXXall 10 · 5 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | RED LION | PA |
| 2016-08-10 | 720-759 | 0–9 XXXall 10 · 6 holders which blocks → | BANDWIDTH.COM CLEC, LLC - CO | 078F | LONGMONT | CO |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/28/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.