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
— 573-623 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
— 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

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.