NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

1 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

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 — NPA 413
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 1
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
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2021-09-23 413-807 0XXX1XXX2XXX3XXX4XXX6XXX9XXX · 5 holders which blocks → METROPCS, INC. 5562 PALMER MA
2021-07-30 413-428 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 AMHERST MA
2021-06-29 413-419 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 CHICOPEE MA
2021-06-18 413-408 0–9 XXXall 10 · 4 holders which blocks → VONAGE AMERICA LLC 197D EASTHAMPTN MA
2021-05-27 413-405 0–9 XXXall 10 · 5 holders which blocks → TELNYX LLC 073H SPRINGFLD MA
2021-05-25 413-766 0–9 XXXall 10 · 2 holders which blocks → SKYE TELECOM LLC DBA SKYETEL 622J SPRINGFLD MA
2021-04-26 413-465 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H HATFIELD MA
2021-04-26 413-699 3XXX9XXX · 2 holders which blocks → FRACTEL, LLC 965H W STOCKBDG MA
2021-04-26 413-946 0XXX1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H HINSDALE MA
2021-04-17 413-399 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 AMHERST MA
2021-04-02 413-867 0–9 XXXall 10 · 5 holders which blocks → COMMIO, LLC 939H SPRINGFLD MA
2021-03-25 413-481 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MA 892D BRIMFIELD MA
2021-03-25 413-483 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - MA 892D ADAMS MA
2021-03-25 413-491 0XXX1XXX2XXX3XXX · 3 holders which blocks → ONVOY, LLC - MA 892D CHESTERFLD MA
2021-03-25 413-514 0XXX1XXX2XXX3XXX4XXX6XXX · 3 holders which blocks → ONVOY, LLC - MA 892D HAMPDEN MA
2021-03-25 413-633 1XXX2XXX3XXX6XXX7XXX · 2 holders which blocks → ONVOY, LLC - MA 892D SHELBUNFLS MA
2021-03-25 413-713 0XXX1XXX3XXX7XXX · 3 holders which blocks → ONVOY, LLC - MA 892D TURNERSFLS MA
2021-03-25 413-724 0XXX2XXX4XXX5XXX6XXX · 4 holders which blocks → ONVOY, LLC - MA 892D WILLIAMSBG MA
2021-03-25 413-741 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MA 892D WILLIAMSTN MA
2021-03-25 413-823 0XXX1XXX2XXX3XXX4XXX · 4 holders which blocks → ONVOY, LLC - MA 892D WORTHINGTN MA
2021-03-11 413-910 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - MA 892D SPRINGFLD MA
2021-03-05 413-393 0–9 XXXall 10 · 5 holders which blocks → STRATUS NETWORKS 495J WESTFIELD MA
2021-02-03 413-392 0XXX1XXX2XXX4XXX8XXX9XXX · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H NORTHFIELD MA
2021-01-27 413-434 0XXX1XXX2XXX3XXX4XXX5XXX · 3 holders which blocks → ONVOY, LLC - MA 892D GILBERTVL MA
2021-01-27 413-656 0XXX1XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → ONVOY, LLC - MA 892D MONTAGUE MA
2021-01-25 413-390 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F SPRINGFLD MA
2020-11-04 413-440 0XXX1XXX2XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → ONVOY SPECTRUM, LLC 624H HUNTINGTON MA
2020-11-04 413-558 0XXX1XXX2XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H WARREN MA
2020-11-04 413-767 0XXX2XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H RUSSELL MA
2020-10-22 413-381 0–9 XXXall 10 · 3 holders which blocks → TWILIO INTERNATIONAL, INC. 506J SPRINGFLD MA
2020-09-08 413-389 0–9 XXXall 10 · 2 holders which blocks → IP HORIZON LLC 515J SPRINGFLD MA
2020-07-23 413-688 0XXX1XXX2XXX6XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H MONSON MA
2020-07-21 413-722 0XXX1XXX2XXX3XXX5XXX6XXX7XXX · 4 holders which blocks → FRACTEL, LLC 965H CONWAY MA
2020-06-16 413-701 0XXX1XXX2XXX3XXX5XXX7XXX · 3 holders which blocks → ONVOY, LLC - MA 892D BECKET MA
2020-06-11 413-380 0XXX3XXX · 2 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K RICHMOND MA
2020-05-28 413-416 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - MA 892D AMHERST MA
2020-05-13 413-613 0XXX1XXX2XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - MA 892D DALTON MA
2020-04-06 413-379 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 AMHERST MA
2020-03-25 413-368 0–9 XXXall 10 · 3 holders which blocks → INTRADO COMMUNICATIONS, LLC 116E SPRINGFLD MA
2020-02-19 413-361 0–9 XXXall 10 · 6 holders which blocks → CSC WIRELESS, LLC 425J SPRINGFLD MA
2019-11-20 413-334 0–9 XXXall 10 · 4 holders which blocks → TELNYX LLC 073H SPRINGFLD MA
2019-10-10 413-414 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → ONVOY, LLC - MA 892D HINSDALE MA
2019-10-10 413-415 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - MA 892D AMHRSTFKLN MA
2019-10-09 413-373 0XXX1XXX3XXX4XXX6XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J CUMMINGTON MA
2019-09-12 413-321 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 WARE MA
2019-08-27 413-312 0–9 XXXall 10 · 3 holders which blocks → EXIANT COMMUNICATIONS LLC 114J SPRINGFLD MA
2019-07-19 413-371 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - MA 892D BELCHERTN MA
2019-03-26 413-305 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. 7135 SOUTHWICK MA
2018-06-25 413-360 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - MA 892D SANDISFLD MA
2018-03-06 413-343 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → VONAGE AMERICA LLC 197D CHESTER MA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.