NumberResearch Membership · Data 09/29/2026

Recent prefix assignments

347 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/29/2026

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 28
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
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
— 573-294 0XXX2XXX3XXX4XXX8XXX9XXX · 3 holders which blocks → BRIGHTSPEED OF MISSOURI, LLC 9787 MORRISON MO
— 573-295 none assigned yet which blocks → KINGDOM TEL. CO. 1901 TEBBETTS MO
— 573-296 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 5 holders which blocks → ONVOY, LLC - MO 093F HALLSVILLE MO
— 573-297 1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM MISSOURI, INC. 1885 WAPPAPLLPK MO
— 573-298 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 5 holders which blocks → SKYE TELECOM LLC DBA SKYETEL 622J JEFFERSNCY MO
— 573-299 0XXX1XXX3XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → BRIGHTSPEED OF MISSOURI, LLC 9787 VICHY MO
— 573-302 5XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 LKOZKOSBCH MO
— 573-304 0XXX1XXX2XXX3XXX5XXX6XXX · 6 holders which blocks → TELNYX LLC 073H CALIFORNIA MO
— 573-305 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BIRCH TREE MO
— 573-306 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - MO 093F EMINENCE MO
— 573-307 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MO 093F WINONA MO
— 573-308 2XXX9XXX which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 ROLLA MO
— 573-309 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - MO 993E BELL CITY MO
— 573-310 0XXX2XXX6XXX7XXX8XXX · 5 holders which blocks → METROPCS, INC. 5562 FULTON MO
— 573-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MO
— 573-313 0–9 XXXall 10 · 8 holders which blocks → ONVOY, LLC - MO 093F BENTON MO
— 573-315 1XXX2XXX3XXX4XXX5XXX6XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 FLAT RIVER MO
— 573-316 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MO 993E CARDWELL MO
— 573-317 4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 CAMDENTON MO
— 573-318 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHAFFEE MO
— 573-320 0XXX2XXX3XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - MO 093F VAN BUREN MO
— 573-322 1XXX2XXX7XXX9XXX · 4 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 ELLSINORE MO
— 573-323 3XXX7XXX · 2 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 VAN BUREN MO
— 573-324 0XXX7XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 BOWLNGGREN MO
— 573-325 0XXX5XXX7XXX · 3 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 WINONA MO
— 573-327 0XXX1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 FLAT RIVER MO
— 573-328 0XXX2XXX3XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 QULIN MO
— 573-329 not yet reported which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 FTLENARDWD MO
— 573-331 9XXX which blocks → SOUTHWESTERN BELL 9533 CAPEGIRARD MO
— 573-332 9XXX which blocks → SOUTHWESTERN BELL 9533 CAPEGIRARD MO
— 573-333 3XXX7XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 CARUTHRSVL MO
— 573-334 not yet reported which blocks → SOUTHWESTERN BELL 9533 CAPEGIRARD MO
— 573-335 not yet reported which blocks → SOUTHWESTERN BELL 9533 CAPEGIRARD MO
— 573-336 not yet reported which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 ST ROBERT MO
— 573-337 3XXX4XXX5XXX6XXX7XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 ST ROBERT MO
— 573-338 none assigned yet which blocks → UNITED STATES CELLULAR - MO 6275 JEFFERSNCY MO
— 573-339 3XXX which blocks → SOUTHWESTERN BELL 9533 CAPEGIRARD MO
— 573-341 not yet reported which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 ROLLA MO
— 573-344 4XXX5XXX6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KENNETT MO
— 573-345 0XXX2XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 CLIMAX SPG MO
— 573-346 not yet reported which blocks → SOUTHWESTERN BELL 9533 CAMDENTON MO
— 573-347 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 CLIMAX SPG MO
— 573-348 not yet reported which blocks → SOUTHWESTERN BELL 9533 LKOZKOSBCH MO
— 573-350 1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLC - MO 093F DELTA MO
— 573-351 0XXX2XXX3XXX4XXX6XXX7XXX · 4 holders which blocks → WINDSTREAM MISSOURI, INC. 1885 DONIPHAN MO
— 573-353 none assigned yet which blocks → T-MOBILE USA, INC. 6529 JEFFERSNCY MO
— 573-354 0XXX1XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → WINDSTREAM MISSOURI, INC. 1885 OXLY MO
— 573-356 0XXX1XXX2XXX which blocks → T-MOBILE USA, INC. 6529 COLUMBIA MO
— 573-357 0XXX6XXX7XXX8XXX · 2 holders which blocks → BPS TELEPHONE COMPANY 0463 PARMA MO
— 573-358 6XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 BONNETERRE MO

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/29/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.