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
— 573-722 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
— 573-730 0XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 CAPEGIRARD MO
— 573-731 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - MO 093F MONROECITY MO
— 573-732 2XXX which blocks → BRIGHTSPEED OF MISSOURI, LLC 9787 BOURBON MO
— 573-733 0XXX2XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 BELL CITY MO
— 573-734 0XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 BISMARCK MO
— 573-735 0XXX6XXX7XXX · 3 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 MONROECITY MO
— 573-736 none assigned yet which blocks → WINDSTREAM MISSOURI, INC. 1885 CROCKER MO
— 573-737 0XXX3XXX5XXX7XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 HORNERSVL MO
— 573-738 0XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 SENATH MO
— 573-739 none assigned yet which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 SALEM MO
— 573-743 not yet reported which blocks → STEELVILLE TEL. EXCH., INC. 1949 CHERRYVL MO
— 573-744 0XXX2XXX3XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 FREEBURG MO
— 573-745 4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 LKOZKOSBCH MO
— 573-747 4XXX5XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 FARMINGTON MO
— 573-748 3XXX4XXX6XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 NEW MADRID MO
— 573-749 1XXX2XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 IRONDALE MO
— 573-751 not yet reported which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 JEFFERSNCY MO
— 573-752 5XXX6XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 DEERING MO
— 573-754 7XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 LOUISIANA MO
— 573-756 not yet reported which blocks → SOUTHWESTERN BELL 9533 FARMINGTON MO
— 573-757 0XXX3XXX4XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 DEERING MO
— 573-759 none assigned yet which blocks → WINDSTREAM MISSOURI, INC. 1885 DIXON MO
— 573-760 none assigned yet which blocks → SOUTHWESTERN BELL 9533 FARMINGTON MO
— 573-761 not yet reported which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 JEFFERSNCY MO
— 573-762 5XXX which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 NEWBURG MO
— 573-763 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → BRIGHTSPEED OF MISSOURI, LLC 9787 CHAMOIS MO
— 573-764 0XXX6XXX which blocks → FIDELITY TELEPHONE, LLC 1882 GERALD MO
— 573-765 6XXX which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 RICHLAND MO
— 573-766 0XXX1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 BELGRADE MO
— 573-767 0XXX2XXX3XXX4XXX6XXX7XXX8XXX · 6 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 MONTICELLO MO
— 573-768 3XXX4XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PERRYVILLE MO
— 573-769 1XXX9XXX · 2 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 PALMYRA MO
— 573-770 2XXX3XXX which blocks → ONVOY, LLC - MO 093F MONTICELLO MO
— 573-771 not yet reported which blocks → BRIGHTSPEED OF MISSOURI, LLC 9784 COLUMBIA MO
— 573-772 3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 POPLAR BLF MO
— 573-773 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → ONVOY, LLC - MO 093F PALMYRA MO
— 573-774 not yet reported which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 WAYNESVL MO
— 573-775 not yet reported which blocks → STEELVILLE TEL. EXCH., INC. 1949 STEELVILLE MO
— 573-776 none assigned yet which blocks → SOUTHWESTERN BELL 9533 POPLAR BLF MO
— 573-778 none assigned yet which blocks → SOUTHWESTERN BELL 9533 POPLAR BLF MO
— 573-779 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 CALEDONIA MO
— 573-782 none assigned yet which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 RUSSELLVL MO
— 573-784 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 FRANKFORD 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.