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 253
QWEST CORPORATION 141
T-MOBILE USA, INC. 77
ONVOY, LLC - WA 49
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 48
NEW CINGULAR WIRELESS PCS, LLC 35
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
— 253-568 not yet reported which blocks → QWEST CORPORATION 9638 TACOMAWVLY WA
— 253-569 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 AUBURN WA
— 253-571 8XXX9XXX which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-572 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-573 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-576 0XXX which blocks → T-MOBILE USA, INC. 6529 TACOMA WA
— 253-579 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 TACOMA WA
— 253-581 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-582 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-583 4XXX6XXX which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-584 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-588 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-589 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-590 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMA WA
— 253-591 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-592 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 TACOMA WA
— 253-593 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-594 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-595 not yet reported which blocks → ONVOY, LLC - WA 483E TACOMA WA
— 253-596 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-597 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-606 none assigned yet which blocks → METROPCS, INC. 5562 TACOMA WA
— 253-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WA
— 253-617 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMA WA
— 253-627 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-630 not yet reported which blocks → QWEST CORPORATION 9638 KENT WA
— 253-631 not yet reported which blocks → QWEST CORPORATION 9638 KENT WA
— 253-638 4XXX5XXX which blocks → QWEST CORPORATION 9638 KENT WA
— 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

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.