NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 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
— 253-530 not yet reported which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 GIG HARBOR WA
— 253-531 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-532 0–9 XXXall 10 · 7 holders which blocks → NUSO, LLC 732J TACOMA WA
— 253-534 5XXX6XXX8XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-535 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-536 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-537 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-538 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-539 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-540 not yet reported which blocks → ONVOY, LLC - WA 483E TACOMA WA
— 253-541 not yet reported which blocks → ONVOY, LLC - WA 483E TACOMA WA
— 253-548 4XXX5XXX6XXX7XXX which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-549 1XXX9XXX which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 GIG HARBOR WA
— 253-550 not yet reported which blocks → ONVOY, LLC - WA 483E TACOMA WA
— 253-552 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST WA
— 253-559 not yet reported which blocks → ONVOY, LLC - WA 483E GRAHAM WA
— 253-561 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 AUBURN WA
— 253-563 not yet reported which blocks → ONVOY, LLC - WA 483E DES MOINES WA
— 253-564 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-565 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-566 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.