NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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, all time — NPA 573
SOUTHWESTERN BELL 128
NEW CINGULAR WIRELESS PCS, LLC - IL 113
ONVOY, LLC - MO 86
LEVEL 3 COMMUNICATIONS, LLC - MO 63
T-MOBILE USA, INC. 44
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
— 573-648 0XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 CENTERVL MO
— 573-649 0XXX4XXX6XXX7XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 E PRAIRIE MO
— 573-651 not yet reported which blocks → SOUTHWESTERN BELL 9533 CAPEGIRARD MO
— 573-652 0XXX2XXX3XXX4XXX6XXX7XXX · 3 holders which blocks → ONVOY, LLC - MO 093F LA GRANGE MO
— 573-653 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 6 holders which blocks → ONVOY, LLC - MO 093F DEERING MO
— 573-654 0XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 CARDWELL MO
— 573-655 1XXX2XXX5XXX · 2 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 LA GRANGE MO
— 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

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.