NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

355 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
ONVOY, LLC - CA 31
NEW CINGULAR WIRELESS PCS, LLC - IL 28
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
— 253-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WA
— 253-414 2XXX3XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 TACOMA WA
— 253-415 not yet reported which blocks → SPOK, INC. 6630 TACOMA WA
— 253-416 not yet reported which blocks → SPOK, INC. 6630 TACOMA WA
— 253-423 not yet reported which blocks → ONVOY, LLC - WA 483E TACOMA WA
— 253-425 not yet reported which blocks → WA
— 253-426 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-428 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-431 none assigned yet which blocks → T-MOBILE USA, INC. 6529 TACOMAWVLY WA
— 253-435 not yet reported which blocks → QWEST CORPORATION 9638 PUYALLUP WA
— 253-437 not yet reported which blocks → QWEST CORPORATION 9638 KENT WA
— 253-439 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 TACOMA WA
— 253-444 7XXX8XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMA WA
— 253-445 not yet reported which blocks → QWEST CORPORATION 9638 PUYALLUP WA
— 253-446 2XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9638 PUYALLUP WA
— 253-449 1XXX3XXX6XXX7XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 DES MOINES WA
— 253-458 5XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KENT WA
— 253-459 0XXX2XXX3XXX4XXX5XXX9XXX which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-460 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-461 not yet reported which blocks → ONVOY, LLC - WA 483E TACOMAWVLY WA
— 253-465 1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 ROY WA
— 253-466 3XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 PUYALLUP WA
— 253-468 none assigned yet which blocks → T-MOBILE USA, INC. 6529 TACOMA WA
— 253-471 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-472 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-473 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-474 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-475 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-476 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-477 0–9 XXXwhole prefix which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-478 0XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 7455 KENT WA
— 253-479 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 KENT WA
— 253-480 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 KENT WA
— 253-484 not yet reported which blocks → ONVOY, LLC - WA 483E TACOMA WA
— 253-486 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 AUBURN WA
— 253-487 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → QWEST CORPORATION 9638 KENT WA
— 253-498 not yet reported which blocks → ONVOY, LLC - WA 483E TACOMA WA
— 253-499 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KENT WA
— 253-501 0XXX1XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SUMNER WA
— 253-502 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-503 9XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 TACOMA WA
— 253-508 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 AUBURN WA
— 253-509 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J GIG HARBOR WA
— 253-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WA
— 253-512 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-514 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 GIG HARBOR WA
— 253-518 3XXX4XXX5XXX8XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 KENT WA
— 253-520 not yet reported which blocks → QWEST CORPORATION 9638 KENT WA
— 253-528 3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → QWEST CORPORATION 9638 DES MOINES WA
— 253-529 not yet reported which blocks → QWEST CORPORATION 9638 DES MOINES 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.