NumberResearch Membership · Data 09/30/2026

Recent prefix assignments

372 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 27
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
New assignments by month Oct 2026 Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 573-836 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CAMDENTON MO
— 573-840 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → SOUTHWESTERN BELL 9533 POPLAR BLF MO
— 573-847 0XXX3XXX4XXX5XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 PAYNESVL MO
— 573-848 4XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 STEELE MO
— 573-851 1XXX9XXX · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - MO 993E SALEM MO
— 573-853 not yet reported which blocks → MARK TWAIN RURAL TEL. CO. 1914 WILLIAMSTN MO
— 573-856 1XXX3XXX5XXX9XXX · 4 holders which blocks → WINDSTREAM MISSOURI, INC. 1885 PATTERSON MO
— 573-857 4XXX5XXX8XXX · 3 holders which blocks → WINDSTREAM MISSOURI, INC. 1885 FAIRDEALNG MO
— 573-858 8XXX9XXX which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 TIMBER MO
— 573-859 0XXX1XXX2XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → BRIGHTSPEED OF MISSOURI, LLC 9785 BELLE MO
— 573-860 0XXX8XXX9XXX which blocks → FIDELITY TELEPHONE, LLC 1882 SULLIVAN MO
— 573-863 2XXX3XXX which blocks → ONVOY, LLC - MO 093F CALIFORNIA MO
— 573-864 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 COLUMBIA MO
— 573-866 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 PATTON MO
— 573-872 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 POPLAR BLF MO
— 573-873 0XXX2XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 CAMDENTON MO
— 573-874 not yet reported which blocks → BRIGHTSPEED OF MISSOURI, LLC 9784 COLUMBIA MO
— 573-875 not yet reported which blocks → BRIGHTSPEED OF MISSOURI, LLC 9784 COLUMBIA MO
— 573-876 not yet reported which blocks → BRIGHTSPEED OF MISSOURI, LLC 9784 COLUMBIA MO
— 573-879 2XXX3XXX8XXX which blocks → ONVOY, LLC - MO 093F LADDONIA MO
— 573-880 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 STEGNVIEVE MO
— 573-881 none assigned yet which blocks → UNITED STATES CELLULAR - MO 6275 COLUMBIA MO
— 573-882 not yet reported which blocks → BRIGHTSPEED OF MISSOURI, LLC 9784 COLUMBIA MO
— 573-883 none assigned yet which blocks → SOUTHWESTERN BELL 9533 STEGNVIEVE MO
— 573-884 not yet reported which blocks → BRIGHTSPEED OF MISSOURI, LLC 9784 COLUMBIA MO
— 573-885 5XXX8XXX · 2 holders which blocks → BRIGHTSPEED OF MISSOURI, LLC 9787 CUBA MO
— 573-886 not yet reported which blocks → BRIGHTSPEED OF MISSOURI, LLC 9784 COLUMBIA MO
— 573-887 0XXX2XXX5XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 CHAFFEE MO
— 573-888 none assigned yet which blocks → SOUTHWESTERN BELL 9533 KENNETT MO
— 573-892 0XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - MO 093F FREMONT MO
— 573-893 not yet reported which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 JEFFERSNCY MO
— 573-894 0XXX4XXX6XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SHELBYVL MO
— 573-895 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TERRA NOVA TELECOM INC. 145J BLOOMFIELD MO
— 573-896 1XXX which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 JEFFERSNCY MO
— 573-897 none assigned yet which blocks → SOUTHWESTERN BELL 9533 LINN MO
— 573-898 0XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 ELSBERRY MO
— 573-901 0XXX1XXX2XXX3XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - MO 093F MALDEN MO
— 573-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MO
— 573-919 0–9 XXXall 10 · 8 holders which blocks → BANDWIDTH.COM CLEC, LLC - MO 993E KENNETT MO
— 573-921 0XXX2XXX3XXX · 2 holders which blocks → ONVOY, LLC - MO 093F EWING MO
— 573-922 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CARUTHRSVL MO
— 573-924 not yet reported which blocks → ELLINGTON TEL. CO. 1874 SWEETWATER MO
— 573-925 0XXX1XXX2XXX · 3 holders which blocks → ONVOY, LLC - MO 093F CENTERVL MO
— 573-927 7XXX which blocks → FIDELITY TELEPHONE, LLC 1882 STANTON MO
— 573-928 2XXX3XXX4XXX7XXX · 2 holders which blocks → ONVOY, LLC - MO 093F MONTAUK MO
— 573-929 1XXX which blocks → WINDSTREAM MISSOURI, INC. 1885 BELLFLOWER MO
— 573-931 2XXX6XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 SIKESTON MO
— 573-933 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CENTRALIA MO
— 573-934 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 FREDERCKTN MO
— 573-938 0XXX which blocks → BANDWIDTH.COM CLEC, LLC - MO 993E STOUTSVL MO

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.