NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

338 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, last 30 days
8X8, INC. 38
NEW CINGULAR WIRELESS PCS, LLC - IL 28
ONVOY, LLC - CA 26
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 18
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
— 253-639 not yet reported which blocks → QWEST CORPORATION 9638 KENT WA
— 253-640 4XXX which blocks → T-MOBILE USA, INC. 6529 TACOMAWVLY WA
— 253-642 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 DES MOINES WA
— 253-645 not yet reported which blocks → ONVOY, LLC - WA 483E ROY WA
— 253-648 not yet reported which blocks → ONVOY, LLC - WA 483E SUMNER WA
— 253-649 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J GIG HARBOR WA
— 253-650 not yet reported which blocks → ONVOY, LLC - WA 483E TACOMA WA
— 253-651 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 TACOMA WA
— 253-652 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 7455 DES MOINES WA
— 253-653 none assigned yet which blocks → T-MOBILE USA, INC. 6529 AUBURN WA
— 253-657 none assigned yet which blocks → QWEST CORPORATION 9638 KENT WA
— 253-660 not yet reported which blocks → ONVOY, LLC - WA 483E TACOMA WA
— 253-661 not yet reported which blocks → QWEST CORPORATION 9638 DES MOINES WA
— 253-663 not yet reported which blocks → ONVOY, LLC - WA 483E TACOMA WA
— 253-666 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMA WA
— 253-669 not yet reported which blocks → ONVOY, LLC - WA 483E TACOMA WA
— 253-670 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 AUBURN WA
— 253-671 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-677 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 TACOMA WA
— 253-678 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 TACOMA WA
— 253-679 not yet reported which blocks → ONVOY, LLC - WA 483E TACOMA WA
— 253-680 9XXX which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-681 2XXX3XXX4XXX5XXX · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 DES MOINES WA
— 253-682 7XXX8XXX9XXX · 2 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 TACOMA WA
— 253-683 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → RAINIER CONNECT, INC. - WA 7720 TACOMA WA
— 253-686 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 TACOMA WA
— 253-687 not yet reported which blocks → SPOK, INC. 6630 TACOMA WA
— 253-691 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 TACOMA WA
— 253-692 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-693 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → RAINIER CONNECT, INC. - WA 7720 PUYALLUP WA
— 253-697 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9638 PUYALLUP WA
— 253-700 not yet reported which blocks → WA
— 253-709 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 AUBURN WA
— 253-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WA
— 253-719 2XXX3XXX4XXX5XXX7XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 TACOMAWVLY WA
— 253-720 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 TACOMA WA
— 253-722 3XXX4XXX6XXX7XXX8XXX9XXX which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 TACOMA WA
— 253-732 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 TACOMA WA
— 253-733 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 DES MOINES WA
— 253-735 not yet reported which blocks → QWEST CORPORATION 9638 AUBURN WA
— 253-736 2XXX3XXX4XXX5XXX · 2 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 AUBURN WA
— 253-737 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 7455 AUBURN WA
— 253-740 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 AUBURN WA
— 253-750 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J SUMNER WA
— 253-751 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-752 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-753 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 TACOMA WA
— 253-754 0–9 XXXall 10 · 2 holders which blocks → METROPCS, INC. 5562 TACOMAWVLY WA
— 253-756 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-759 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA

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.