NumberResearch Membership · Data 09/30/2026

Recent prefix assignments

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

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
Rogers Communications Canada Inc. (Wireless) 46
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
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
— 541-974 8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ALBANY OR
— 541-975 0XXX6XXX8XXX9XXX · 3 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4323 LA GRANDE OR
— 541-976 not yet reported which blocks → OR
— 541-977 1XXX which blocks → UNITED STATES CELLULAR - OR 6349 BEND OR
— 541-978 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → UNITED STATES CELLULAR - OR 6349 THE DALLES OR
— 541-979 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ALBANY OR
— 541-980 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 THE DALLES OR
— 541-981 2XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → METROPCS, INC. 5562 ALBANY OR
— 541-982 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → UNITED STATES CELLULAR - OR 6349 COOS BAY OR
— 541-983 not yet reported which blocks → HELIX TEL. CO. 2376 MEACHAM OR
— 541-984 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-987 not yet reported which blocks → OREGON TEL. CORP. 2389 DAYVILLE OR
— 541-988 not yet reported which blocks → QWEST CORPORATION 9638 EUGENE OR
— 541-989 not yet reported which blocks → CENTURYTEL OF OREGON, INC. DBA CENTURYLINK 2360 LEXINGTON OR
— 541-990 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 ALBANY OR
— 541-991 3XXX4XXX5XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 FLORENCE OR
— 541-992 7XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LINCOLN CY OR
— 541-993 none assigned yet which blocks → UNITED STATES CELLULAR - OR 6349 THE DALLES OR
— 541-994 not yet reported which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 4520 LINCOLN CY OR
— 541-995 0XXX5XXX7XXX · 3 holders which blocks → QWEST CORPORATION 9638 HARRISBURG OR
— 541-996 not yet reported which blocks → UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR 4520 LINCOLN CY OR
— 541-997 not yet reported which blocks → QWEST CORPORATION 9638 FLORENCE OR
— 541-998 not yet reported which blocks → QWEST CORPORATION 9638 JUNCTIONCY OR
— 541-999 3XXX4XXX5XXX6XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR 5820 FLORENCE OR
— 551-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NJ
— 551-222 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - NJ 637C JERSEYCITY NJ
— 551-285 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLC - NJ 637C RUTHERFORD NJ
— 551-304 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 RUTHERFORD NJ
— 551-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NJ
— 551-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NJ
— 551-430 0–9 XXXall 10 · 6 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NJ 6623 JERSEYCITY NJ
— 551-432 not yet reported which blocks → OMNIPOINT COMMUNICATIONS, INC. - NJ 6623 BAYONNE NJ
— 551-444 0–9 XXXall 10 · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 FAIR LAWN NJ
— 551-449 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 HACKENSACK NJ
— 551-500 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - NJ 637C RAMSEY NJ
— 551-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NJ
— 551-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST NJ
— 551-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NJ
— 551-666 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - NJ 637C BAYONNE NJ
— 551-700 not yet reported which blocks → NJ
— 551-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NJ
— 551-777 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 RAMSEY NJ
— 551-800 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - NJ 637C WESTWOOD NJ
— 551-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NJ
— 551-900 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - NJ 637C DUMONT NJ
— 551-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NJ
— 551-950 not yet reported which blocks → NJ
— 551-958 not yet reported which blocks → NJ
— 551-959 not yet reported which blocks → NJ
— 551-976 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NJ

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/30/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.