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
— 480-560 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PHOENIX AZ
— 480-562 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J PHOENIX AZ
— 480-563 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-567 2XXX4XXX5XXX6XXX8XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PHOENIX AZ
— 480-570 not yet reported which blocks → T-MOBILE USA, INC. 6529 PHOENIX AZ
— 480-575 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-576 0–9 XXXall 10 · 5 holders which blocks → TELNYX LLC 073H PHOENIX AZ
— 480-580 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PHOENIX AZ
— 480-583 0–9 XXXwhole prefix which blocks → COMCAST IP PHONE, LLC 318J PHOENIX AZ
— 480-584 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J PHOENIX AZ
— 480-585 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-586 0XXX1XXX4XXX5XXX6XXX7XXX8XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PHOENIX AZ
— 480-587 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J PHOENIX AZ
— 480-588 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J PHOENIX AZ
— 480-592 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-595 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-596 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-598 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-600 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PHOENIX AZ
— 480-603 4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PHOENIX AZ
— 480-606 2XXX8XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - AZ 7217 PHOENIX AZ
— 480-607 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-609 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-610 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX AZ
— 480-612 0XXX1XXX2XXX3XXX4XXX5XXX7XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PHOENIX AZ
— 480-614 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-615 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-620 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
— 480-624 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-626 0–9 XXXall 10 · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7175 PHOENIX AZ
— 480-627 9XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - AZ 7217 PHOENIX AZ
— 480-628 not yet reported which blocks → T-MOBILE USA, INC. 6529 PHOENIX AZ
— 480-629 4XXX5XXX8XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - AZ 7217 PHOENIX AZ
— 480-632 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-633 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-634 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - AZ 7217 PHOENIX AZ
— 480-635 2XXX6XXX · 2 holders which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-636 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - AZ 7217 PHOENIX AZ
— 480-638 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-641 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-642 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-643 0XXX9XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - AZ 7217 PHOENIX AZ
— 480-644 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-648 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 PHOENIX AZ
— 480-649 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-650 0XXX which blocks → T-MOBILE USA, INC. 6529 PHOENIX AZ
— 480-654 not yet reported which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-655 3XXX which blocks → QWEST CORPORATION 9636 PHOENIX AZ
— 480-656 0–9 XXXwhole prefix which blocks → COMCAST IP PHONE, LLC 318J PHOENIX AZ

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.