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
— 253-343 0–9 XXXall 10 · 6 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 TACOMA WA
— 253-344 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 TACOMAWVLY WA
— 253-350 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 AUBURN WA
— 253-351 not yet reported which blocks → QWEST CORPORATION 9638 AUBURN WA
— 253-359 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 7455 TACOMA WA
— 253-360 not yet reported which blocks → WA
— 253-369 not yet reported which blocks → ONVOY, LLC - WA 483E TACOMA WA
— 253-370 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 TACOMA WA
— 253-372 2XXX8XXX which blocks → QWEST CORPORATION 9638 KENT WA
— 253-373 8XXX which blocks → QWEST CORPORATION 9638 KENT WA
— 253-375 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 GRAHAM WA
— 253-376 none assigned yet which blocks → T-MOBILE USA, INC. 6529 TACOMA WA
— 253-377 none assigned yet which blocks → T-MOBILE USA, INC. 6529 TACOMA WA
— 253-380 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 TACOMA WA
— 253-381 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 TACOMA WA
— 253-382 5XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-383 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-387 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - WA 483E PUYALLUP WA
— 253-389 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 TACOMA WA
— 253-390 not yet reported which blocks → ONVOY, LLC - WA 483E TACOMA WA
— 253-395 not yet reported which blocks → QWEST CORPORATION 9638 KENT WA
— 253-396 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-397 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 AUBURN WA
— 253-398 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 KENT WA
— 253-399 not yet reported which blocks → ONVOY, LLC - WA 483E TACOMA WA
— 253-403 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-404 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-405 none assigned yet which blocks → T-MOBILE USA, INC. 6529 TACOMA WA
— 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

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.