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
— 573-518 5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 FLAT RIVER MO
— 573-519 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 CAPEGIRARD MO
— 573-521 1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NEW MADRID MO
— 573-522 not yet reported which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 JEFFERSNCY MO
— 573-526 not yet reported which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 JEFFERSNCY MO
— 573-528 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WAYNESVL MO
— 573-529 2XXX4XXX5XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 COLUMBIA MO
— 573-531 0XXX2XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → ONVOY, LLC - MO 093F TIMBER MO
— 573-537 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ROLLA MO
— 573-538 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → ONVOY, LLC - MO 093F BOSS MO
— 573-543 0XXX6XXX7XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 ST MARYS MO
— 573-545 0XXX2XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 BENTON MO
— 573-546 9XXX which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 IRONTON MO
— 573-547 0XXX which blocks → SOUTHWESTERN BELL 9533 PERRYVILLE MO
— 573-548 0XXX1XXX4XXX5XXX · 3 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 MONTAUK MO
— 573-549 3XXX4XXX7XXX8XXX which blocks → WINDSTREAM MISSOURI, INC. 1885 MIDDLETOWN MO
— 573-551 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLC - MO 093F KENNETT MO
— 573-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST MO
— 573-556 not yet reported which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 JEFFERSNCY MO
— 573-558 not yet reported which blocks → ELLINGTON TEL. CO. 1874 REDFORD MO
— 573-562 0XXX3XXX5XXX6XXX8XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 LEADWOOD MO
— 573-563 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 FTLENARDWD MO
— 573-564 0XXX4XXX5XXX7XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 MONTGORYCY MO
— 573-565 0XXX4XXX5XXX7XXX · 4 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 PERRY MO
— 573-568 0XXX6XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 BLOOMFIELD MO
— 573-570 2XXX3XXX4XXX5XXX · 2 holders which blocks → ONVOY, LLC - MO 093F PERRY MO
— 573-574 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - MO 093F MONTGORYCY MO
— 573-576 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CAPEGIRARD MO
— 573-578 5XXX7XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROLLA MO
— 573-579 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CAPEGIRARD MO
— 573-581 not yet reported which blocks → SOUTHWESTERN BELL 9533 MEXICO MO
— 573-582 9XXX which blocks → SOUTHWESTERN BELL 9533 MEXICO MO
— 573-584 1XXX2XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 CENTERTOWN MO
— 573-585 0XXX5XXX · 2 holders which blocks → ONVOY, LLC - MO 093F ELLSINORE MO
— 573-587 5XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 CAPEGIRARD MO
— 573-588 6XXX8XXX · 2 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 SHELBINA MO
— 573-589 0XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SHELBINA MO
— 573-590 7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 FULTON MO
— 573-592 9XXX which blocks → SOUTHWESTERN BELL 9533 FULTON MO
— 573-593 1XXX5XXX8XXX · 3 holders which blocks → WINDSTREAM MISSOURI, INC. 1885 GRANDIN MO
— 573-594 4XXX5XXX8XXX · 2 holders which blocks → WINDSTREAM MISSOURI, INC. 1885 VANDALIA MO
— 573-596 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 FTLENARDWD MO
— 573-598 0XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 ANNAPOLIS MO
— 573-599 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - MO 093F TUSCUMBIA MO
— 573-609 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 POPLAR BLF MO
— 573-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MO
— 573-614 5XXX7XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 DEXTER MO
— 573-619 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JEFFERSNCY MO
— 573-620 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 SIKESTON MO
— 573-621 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 SIKESTON 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.