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
— 253-226 not yet reported which blocks → T-MOBILE USA, INC. 6529 TACOMA WA
— 253-227 not yet reported which blocks → T-MOBILE USA, INC. 6529 TACOMA WA
— 253-228 not yet reported which blocks → T-MOBILE USA, INC. 6529 TACOMA WA
— 253-229 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 TACOMA WA
— 253-230 not yet reported which blocks → T-MOBILE USA, INC. 6529 TACOMA WA
— 253-231 0XXX1XXX2XXX3XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMAWVLY WA
— 253-232 not yet reported which blocks → T-MOBILE USA, INC. 6529 TACOMA WA
— 253-238 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMA WA
— 253-239 0XXX2XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KENT WA
— 253-241 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 TACOMA WA
— 253-242 0XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 TACOMAWVLY WA
— 253-243 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - WA 483E KENT WA
— 253-261 none assigned yet which blocks → T-MOBILE USA, INC. 6529 AUBURN WA
— 253-262 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → RAINIER CONNECT, INC. - WA 7720 GRAHAM WA
— 253-265 4XXX5XXX7XXX9XXX · 2 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 GIG HARBOR WA
— 253-269 2XXX7XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 AUBURN WA
— 253-270 not yet reported which blocks → ONVOY, LLC - WA 483E KENT WA
— 253-272 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-274 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-275 5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 AUBURN WA
— 253-276 not yet reported which blocks → ONVOY, LLC - WA 483E TACOMA WA
— 253-278 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 TACOMA WA
— 253-279 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 TACOMA WA
— 253-280 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-284 6XXX which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 TACOMA WA
— 253-286 0XXX7XXX8XXX9XXX · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 PUYALLUP WA
— 253-288 not yet reported which blocks → QWEST CORPORATION 9638 AUBURN WA
— 253-289 0–9 XXXall 10 · 4 holders which blocks → TELNYX LLC 073H AUBURN WA
— 253-291 not yet reported which blocks → SPOK, INC. 6630 TACOMA WA
— 253-295 not yet reported which blocks → ONVOY, LLC - WA 483E TACOMA WA
— 253-297 9XXX which blocks → T-MOBILE USA, INC. 6529 TACOMAWVLY WA
— 253-302 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 TACOMA WA
— 253-303 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J GIG HARBOR WA
— 253-305 not yet reported which blocks → QWEST CORPORATION 9638 TACOMA WA
— 253-306 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 TACOMA WA
— 253-307 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 TACOMA WA
— 253-309 not yet reported which blocks → SPOK, INC. 6630 TACOMA WA
— 253-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WA
— 253-312 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 TACOMA WA
— 253-313 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J GIG HARBOR WA
— 253-318 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 TACOMA WA
— 253-320 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 TACOMA WA
— 253-321 0XXX1XXX2XXX3XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SUMNER WA
— 253-322 not yet reported which blocks → ONVOY, LLC - WA 483E TACOMA WA
— 253-323 not yet reported which blocks → ONVOY, LLC - WA 483E TACOMA WA
— 253-333 not yet reported which blocks → QWEST CORPORATION 9638 AUBURN WA
— 253-334 not yet reported which blocks → T-MOBILE USA, INC. 6529 AUBURN WA
— 253-335 not yet reported which blocks → T-MOBILE USA, INC. 6529 AUBURN WA
— 253-337 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 TACOMAWVLY WA
— 253-341 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 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.