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
— 573-578 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
— 573-623 0XXX2XXX6XXX7XXX · 3 holders which blocks → ONVOY, LLC - MO 093F OATES MO
— 573-624 not yet reported which blocks → SOUTHWESTERN BELL 9533 DEXTER MO
— 573-626 3XXX6XXX8XXX · 2 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 BOSS MO
— 573-627 7XXX8XXX which blocks → FIDELITY TELEPHONE, LLC 1882 JAPAN MO
— 573-628 0XXX2XXX6XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 WARDELL MO
— 573-631 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FARMINGTON MO
— 573-632 none assigned yet which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 JEFFERSNCY MO
— 573-633 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 SHELBYVL MO
— 573-634 not yet reported which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 JEFFERSNCY MO
— 573-635 not yet reported which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 JEFFERSNCY MO
— 573-636 not yet reported which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 JEFFERSNCY MO
— 573-637 1XXX3XXX4XXX5XXX · 3 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 LESTERVL MO
— 573-638 8XXX which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 JEFFERSNCY MO
— 573-639 2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 COLUMBIA MO
— 573-641 0XXX1XXX2XXX3XXX4XXX8XXX · 4 holders which blocks → BRIGHTSPEED OF MISSOURI, LLC 9784 CLARK MO
— 573-642 not yet reported which blocks → SOUTHWESTERN BELL 9533 FULTON MO
— 573-643 3XXX4XXX5XXX7XXX8XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 MARSTON MO
— 573-644 0XXX1XXX2XXX3XXX4XXX6XXX7XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JEFFERSNCY MO
— 573-645 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JEFFERSNCY MO
— 573-646 0XXX1XXX2XXX4XXX6XXX8XXX9XXX · 4 holders which blocks → BRIGHTSPEED OF MISSOURI, LLC 9787 BLAND MO
— 573-647 2XXX3XXX4XXX7XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 ROLLA MO
— 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

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.