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
— 253-291 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
— 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

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.