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 417
SOUTHWESTERN BELL 100
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 88
BRIGHTSPEED OF MISSOURI, LLC 82
NEW CINGULAR WIRELESS PCS, LLC - IL 51
ONVOY, LLC - MO 40
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
— 417-549 1XXX3XXX4XXX5XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 NEVADA MO
— 417-552 0XXX2XXX5XXX7XXX8XXX · 4 holders which blocks → ONVOY, LLC - MO 093F JENKINS MO
— 417-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST MO
— 417-561 3XXX6XXX7XXX · 3 holders which blocks → BRIGHTSPEED OF MISSOURI, LLC 9787 ROCKAWYBCH MO
— 417-562 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 MARSHFIELD MO
— 417-567 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J FAIR GROVE MO
— 417-568 7XXX8XXX · 2 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J HURLEY MO
— 417-569 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SPRINGFLD MO
— 417-572 0XXX1XXX3XXX5XXX6XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 JOPLIN MO
— 417-574 0XXX3XXX4XXX · 2 holders which blocks → BRIGHTSPEED OF MISSOURI, LLC 9787 JENKINS MO
— 417-575 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-576 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → AT&T - LOCAL 7421 SPRINGFLD MO
— 417-577 not yet reported which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-578 not yet reported which blocks → SOUTHWESTERN BELL 9533 JOPLIN MO
— 417-581 not yet reported which blocks → BRIGHTSPEED OF MISSOURI, LLC 9787 OZARK MO
— 417-582 3XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → BRIGHTSPEED OF MISSOURI, LLC 9787 OZARK MO
— 417-583 3XXX which blocks → SOUTHWESTERN BELL 9533 CLEVER MO
— 417-587 4XXX8XXX · 2 holders which blocks → BRIGHTSPEED OF MISSOURI, LLC 9787 HIGHLANDVL MO
— 417-588 not yet reported which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 LEBANON MO
— 417-589 1XXX5XXX7XXX9XXX · 4 holders which blocks → BRIGHTSPEED OF MISSOURI, LLC 9787 CONWAY MO
— 417-591 2XXX3XXX9XXX · 2 holders which blocks → ONVOY, LLC - MO 093F ARCOLA MO
— 417-593 2XXX4XXX5XXX7XXX8XXX which blocks → AERIAL COMMUNICATIONS, INC. 6701 BRANSON MO
— 417-594 2XXX4XXX6XXX7XXX8XXX · 3 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 LEBANON MO
— 417-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MO
— 417-616 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MO 6123 SPRINGFLD MO
— 417-620 0XXX2XXX3XXX4XXX5XXX6XXX9XXX · 3 holders which blocks → ONVOY, LLC - MO 093F CONWAY MO
— 417-621 1XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 JOPLIN MO
— 417-623 9XXX which blocks → SOUTHWESTERN BELL 9533 JOPLIN MO
— 417-624 not yet reported which blocks → SOUTHWESTERN BELL 9533 JOPLIN MO
— 417-625 not yet reported which blocks → SOUTHWESTERN BELL 9533 JOPLIN MO
— 417-626 none assigned yet which blocks → SOUTHWESTERN BELL 9533 JOPLIN MO
— 417-627 5XXX which blocks → SOUTHWESTERN BELL 9533 JOPLIN MO
— 417-628 not yet reported which blocks → LE-RU TEL. CO. 1908 STELLA MO
— 417-629 2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 JOPLIN MO
— 417-631 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD MO
— 417-632 1XXX2XXX3XXX6XXX8XXX9XXX · 3 holders which blocks → WINDSTREAM MISSOURI, INC. 1885 FAIRVIEW MO
— 417-634 none assigned yet which blocks → BRIGHTSPEED OF MISSOURI, LLC 9787 SPARTA MO
— 417-635 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 MONETT MO
— 417-637 1XXX3XXX4XXX6XXX7XXX · 4 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 GREENFIELD MO
— 417-638 1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → WINDSTREAM MISSOURI, INC. 1885 STARK CITY MO
— 417-639 not yet reported which blocks → CRAW-KAN TEL. COOP.,INC. - KS 1818 E ARCADIA MO
— 417-640 0XXX2XXX3XXX7XXX9XXX · 4 holders which blocks → ONVOY, LLC - MO 093F AVILLA MO
— 417-641 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - MO 093F HIGHLANDVL MO
— 417-642 not yet reported which blocks → CRAW-KAN TEL. COOP.,INC. - MO 1759 ASBURY MO
— 417-644 3XXX4XXX6XXX8XXX9XXX · 3 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 LOWRY CITY MO
— 417-646 0XXX3XXX4XXX6XXX7XXX9XXX · 4 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 OSCEOLA MO
— 417-649 0XXX3XXX4XXX5XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 CARL JCT MO
— 417-652 2XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → WINDSTREAM MISSOURI, INC. 1885 WHEATON MO
— 417-654 3XXX which blocks → WINDSTREAM MISSOURI, INC. 1885 FAIR PLAY MO
— 417-655 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 SPRINGFLD 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.