NumberResearch Membership · Data 09/29/2026

Recent prefix assignments

347 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/29/2026

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
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
Rogers Communications Canada Inc. (Wireless) 23
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
— 573-656 1XXX2XXX5XXX6XXX · 3 holders which blocks → WINDSTREAM MISSOURI, INC. 1885 OLNEY MO
— 573-657 3XXX which blocks → BRIGHTSPEED OF MISSOURI, LLC 9784 ASHLAND MO
— 573-659 not yet reported which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 JEFFERSNCY MO
— 573-660 1XXX2XXX3XXX8XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DONIPHAN MO
— 573-663 not yet reported which blocks → ELLINGTON TEL. CO. 1874 ELLINGTON MO
— 573-665 0XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - MO 093F PAYNESVL MO
— 573-667 0XXX2XXX3XXX4XXX6XXX7XXX8XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 MOREHOUSE MO
— 573-669 2XXX4XXX6XXX8XXX9XXX · 4 holders which blocks → WINDSTREAM MISSOURI, INC. 1885 NEW HARTFD MO
— 573-671 0XXX1XXX2XXX3XXX6XXX7XXX · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - MO 993E LICKING MO
— 573-672 0XXX2XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 STOUTSVL MO
— 573-673 none assigned yet which blocks → T-MOBILE USA, INC. 6529 COLUMBIA MO
— 573-674 0XXX5XXX6XXX7XXX · 3 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 LICKING MO
— 573-675 2XXX6XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 WYATT MO
— 573-676 none assigned yet which blocks → KINGDOM TEL. CO. 1901 MOKANE MO
— 573-678 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 RICHWOODS MO
— 573-680 none assigned yet which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JEFFERSNCY MO
— 573-681 none assigned yet which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 JEFFERSNCY MO
— 573-682 0XXX4XXX7XXX which blocks → BRIGHTSPEED OF MISSOURI, LLC 9784 CENTRALIA MO
— 573-683 8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 CHARLESTON MO
— 573-684 3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 WELLSVILLE MO
— 573-685 0XXX3XXX4XXX6XXX7XXX · 3 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 SANTA FE MO
— 573-686 not yet reported which blocks → SOUTHWESTERN BELL 9533 POPLAR BLF MO
— 573-687 0XXX1XXX4XXX6XXX8XXX9XXX · 4 holders which blocks → BRIGHTSPEED OF MISSOURI, LLC 9784 STURGEON MO
— 573-688 0XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 LILBOURN MO
— 573-689 6XXX7XXX · 2 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 BUNKER MO
— 573-690 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JEFFERSNCY MO
— 573-691 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → UNITED STATES CELLULAR - MO 6275 JEFFERSNCY MO
— 573-692 2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LKOZKOSBCH MO
— 573-693 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 LKOZKOSBCH MO
— 573-694 6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JEFFERSNCY MO
— 573-695 0XXX which blocks → BPS TELEPHONE COMPANY 0463 STEELE MO
— 573-696 4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → BRIGHTSPEED OF MISSOURI, LLC 9784 HALLSVILLE MO
— 573-697 3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 BELLEVIEW MO
— 573-698 0XXX1XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → BRIGHTSPEED OF MISSOURI, LLC 9784 ROCHEPORT MO
— 573-699 1XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → BRIGHTSPEED OF MISSOURI, LLC 9787 SAFE MO
— 573-700 not yet reported which blocks → MO
— 573-701 none assigned yet which blocks → SOUTHWESTERN BELL 9533 FARMINGTON MO
— 573-709 1XXX which blocks → ONVOY, LLC - MO 093F CLARKSBURG MO
— 573-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MO
— 573-712 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 POPLAR BLF MO
— 573-717 4XXX5XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 KENNETT MO
— 573-718 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 POPLAR BLF MO
— 573-720 0XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 BLYTHEVL MO
— 573-722 0XXX2XXX4XXX6XXX7XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 ADVANCE MO
— 573-724 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HAYTI MO
— 573-725 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - MO 093F LOUISIANA MO
— 573-726 4XXX6XXX7XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 BERNIE MO
— 573-727 1XXX3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 POPLAR BLF MO
— 573-728 0XXX2XXX3XXX4XXX5XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 ARGYLE MO
— 573-729 not yet reported which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 SALEM MO

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/29/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.