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
2026-03-20 253-450 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 TACOMAWVLY WA
2026-03-17 253-587 0XXX1XXX7XXX8XXX9XXX · 2 holders which blocks → LIVEWIRE TELECOM LLC 048L TACOMA WA
2026-01-20 253-443 0XXX1XXX2XXX3XXX4XXX5XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 AUBURN WA
2025-12-05 253-440 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 TACOMA WA
2025-11-07 253-436 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 AUBURN WA
2025-09-05 253-430 0XXX1XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 GIG HARBOR WA
2025-08-21 253-429 0–9 XXXall 10 · 2 holders which blocks → AT&T - LOCAL 7421 AUBURN WA
2025-07-14 253-427 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 TACOMA WA
2025-06-20 253-424 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 AUBURN WA
2025-06-02 253-422 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 AUBURN WA
2025-03-07 253-421 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 AUBURN WA
2024-11-26 253-420 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 AUBURN WA
2024-10-15 253-419 0XXX1XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KENT WA
2024-10-11 253-417 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 AUBURN WA
2024-10-11 253-418 0XXX1XXX2XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 PUYALLUP WA
2024-05-31 253-413 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 AUBURN WA
2024-05-03 253-412 0–9 XXXall 10 · 6 holders which blocks → VONAGE AMERICA LLC 197D TACOMA WA
2024-03-29 253-410 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 AUBURN WA
2024-03-01 253-408 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 PUYALLUP WA
2024-02-22 253-407 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 AUBURN WA
2024-01-12 253-406 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 GRAHAM WA
2024-01-02 253-401 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 TACOMA WA
2023-09-11 253-388 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 AUBURN WA
2023-08-31 253-386 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 PUYALLUP WA
2023-04-25 253-384 0–9 XXXall 10 · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J TACOMA WA
2023-04-14 253-379 1XXX7XXX · 2 holders which blocks → ONVOY, LLC - WA 483E ROY WA
2023-01-23 253-385 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - WA 483E GRAHAM WA
2023-01-13 253-378 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 AUBURN WA
2023-01-10 253-362 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - WA 483E SUMNER WA
2023-01-10 253-452 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - WA 483E KENT WA
2022-10-03 253-402 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 AUBURN WA
2022-09-01 253-453 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - WA 483E TACOMAWVLY WA
2022-08-30 253-434 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - WA 483E PUYALLUP WA
2022-08-12 253-308 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 AUBURN WA
2022-04-15 253-247 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 AUBURN WA
2022-03-25 253-364 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SUMNER WA
2022-03-22 253-340 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 KENT WA
2022-02-14 253-354 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 TACOMA WA
2022-01-07 253-349 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 AUBURN WA
2021-09-28 253-374 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 AUBURN WA
2021-08-31 253-367 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 GRAHAM WA
2021-08-25 253-676 0–9 XXXall 10 · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J TACOMAWVLY WA
2021-08-19 253-500 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H TACOMAWVLY WA
2021-06-07 253-357 0–9 XXXall 10 · 4 holders which blocks → TELNYX LLC 073H TACOMA WA
2021-04-29 253-356 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H TACOMA WA
2021-04-29 253-400 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H GIG HARBOR WA
2021-04-29 253-600 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H AUBURN WA
2021-03-31 253-544 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - WA 483E PUYALLUP WA
2021-03-18 253-346 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 TACOMA WA
2021-03-10 253-296 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 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.