NumberResearch Membership · Data 09/25/2026

Recent prefix assignments

358 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/25/2026

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. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 31
ONVOY, LLC - CA 27
NEW CINGULAR WIRELESS PCS, LLC - IL 27
ONVOY, LLC - NJ 15
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
— 307-326 not yet reported which blocks → UNION TEL. CO. 2297 SARATOGA WY
— 307-327 not yet reported which blocks → UNION TEL. CO. 2297 ENCAMPMENT WY
— 307-328 5XXX which blocks → QWEST CORPORATION 9636 RAWLINS WY
— 307-329 not yet reported which blocks → UNION TELEPHONE COMPANY 013B SARATOGA WY
— 307-330 not yet reported which blocks → UNION TELEPHONE COMPANY 013B LANDER WY
— 307-331 6XXX7XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 6566 WHEATLAND WY
— 307-332 not yet reported which blocks → QWEST CORPORATION 9636 LANDER WY
— 307-333 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 732J CASPER WY
— 307-334 1XXX which blocks → QWEST CORPORATION 9636 LUSK WY
— 307-335 1XXX3XXX4XXX5XXX · 3 holders which blocks → QWEST CORPORATION 9636 LANDER WY
— 307-339 not yet reported which blocks → UNION TELEPHONE COMPANY 013B HANNA WY
— 307-340 3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 6566 LUSK WY
— 307-341 not yet reported which blocks → PROJECT TEL. CO., INC. 2250 SOUTHWYOLA WY
— 307-342 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - WY 450F JACKSON WY
— 307-344 1XXX3XXX4XXX · 2 holders which blocks → QWEST CORPORATION 9636 MAMMOTH WY
— 307-345 not yet reported which blocks → UNION TELEPHONE COMPANY 013B LANDER WY
— 307-347 not yet reported which blocks → RT COMMUNICATIONS 3410 WORLAND WY
— 307-348 not yet reported which blocks → UNION TEL. CO. 2297 HANNA WY
— 307-349 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 6566 LANDER WY
— 307-350 not yet reported which blocks → UNION TELEPHONE COMPANY 013B ROCK SPG WY
— 307-351 7XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 DOUGLAS WY
— 307-352 9XXX which blocks → QWEST CORPORATION 9636 ROCK SPG WY
— 307-353 not yet reported which blocks → COLUMBINE TELCO DBA SILVER STAR COMMUNICATIONS 2214 ALTA WY
— 307-356 not yet reported which blocks → UNION TEL. CO. 2297 SHIRLEBSIN WY
— 307-358 not yet reported which blocks → QWEST CORPORATION 9636 DOUGLAS WY
— 307-359 4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 6566 DOUGLAS WY
— 307-360 not yet reported which blocks → UNION TELEPHONE COMPANY 013B PINEDALE WY
— 307-362 not yet reported which blocks → QWEST CORPORATION 9636 ROCK SPG WY
— 307-366 not yet reported which blocks → TRI-COUNTY TEL. ASSN., INC. 2296 TEN SLEEP WY
— 307-367 0XXX which blocks → CENTURYTEL OF WYOMING, INC. DBA CENTURYLINK 2299 PINEDALE WY
— 307-370 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 6566 RAWLINS WY
— 307-371 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 6566 ROCK SPG WY
— 307-373 2XXX3XXX6XXX · 3 holders which blocks → BRESNAN BROADBAND OF WYOMING, LLC - WY [CHARTER] 009E GREYBULL WY
— 307-374 0–9 XXXall 10 · 4 holders which blocks → VONAGE AMERICA LLC 197D ROCK SPG WY
— 307-375 not yet reported which blocks → RT COMMUNICATIONS 3410 WORLAND WY
— 307-377 not yet reported which blocks → UNION TELEPHONE COMPANY 013B CASPER WY
— 307-378 not yet reported which blocks → UNION TEL. CO. 2297 ROCK RIVER WY
— 307-379 1XXX which blocks → CENTURYTEL OF WYOMING, INC. DBA CENTURYLINK 2299 MEDICINBOW WY
— 307-380 not yet reported which blocks → UNION TELEPHONE COMPANY 013B BAGGS WY
— 307-382 not yet reported which blocks → QWEST CORPORATION 9636 ROCK SPG WY
— 307-383 not yet reported which blocks → DUBOIS TEL. EXCH., INC. 2291 BAGGS WY
— 307-386 not yet reported which blocks → UNION TEL. CO. 2297 LABARGE WY
— 307-388 1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 WORLAND WY
— 307-389 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 6566 ROCK SPG WY
— 307-390 not yet reported which blocks → UNION TELEPHONE COMPANY 013B LABARGE WY
— 307-401 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 TORRINGTON WY
— 307-406 not yet reported which blocks → WY
— 307-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WY
— 307-417 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLC - WY 450F RAWLINS WY
— 307-421 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY 6566 CHEYENNE WY

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/25/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.