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 573
SOUTHWESTERN BELL 128
NEW CINGULAR WIRELESS PCS, LLC - IL 113
ONVOY, LLC - MO 86
LEVEL 3 COMMUNICATIONS, LLC - MO 63
T-MOBILE USA, INC. 44
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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 573-286 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LKOZKOSBCH MO
— 573-288 4XXX9XXX · 2 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 CANTON MO
— 573-289 5XXX6XXX7XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 COLUMBIA MO
— 573-290 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → SOUTHWESTERN BELL 9533 CAPEGIRARD MO
— 573-291 5XXX6XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JEFFERSNCY MO
— 573-292 0XXX2XXX5XXX6XXX7XXX8XXX9XXX which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 BIRCH TREE MO
— 573-293 0XXX which blocks → BPS TELEPHONE COMPANY 0463 BERNIE MO
— 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

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.