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
Download CSV ↓
Quick find in this area code:
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 573-226 0XXX2XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 EMINENCE MO
— 573-228 5XXX6XXX8XXX9XXX · 3 holders which blocks → UNITED STATES CELLULAR - MO 6275 COLUMBIA MO
— 573-229 0XXX2XXX3XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 META MO
— 573-230 0XXX which blocks → T-MOBILE USA, INC. 6529 JEFFERSNCY MO
— 573-231 4XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 HANNIBAL MO
— 573-234 0XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → BRIGHTSPEED OF MISSOURI, LLC 9784 COLUMBIA MO
— 573-236 none assigned yet which blocks → KINGDOM TEL. CO. 1901 RHINELAND MO
— 573-237 7XXX8XXX · 2 holders which blocks → FIDELITY TELEPHONE, LLC 1882 NEW HAVEN MO
— 573-238 6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 MARBLEHILL MO
— 573-239 4XXX5XXX6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 COLUMBIA MO
— 573-241 2XXX3XXX4XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 CUBA MO
— 573-242 0XXX2XXX4XXX5XXX6XXX8XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 CLARKSVL MO
— 573-243 not yet reported which blocks → SOUTHWESTERN BELL 9533 JACKSON MO
— 573-244 not yet reported which blocks → STEELVILLE TEL. EXCH., INC. 1949 VIBURNUM MO
— 573-245 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → BRIGHTSPEED OF MISSOURI, LLC 9787 LEASBURG MO
— 573-246 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 CAMPBELL MO
— 573-247 4XXX5XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SALEM MO
— 573-248 none assigned yet which blocks → SOUTHWESTERN BELL 9533 HANNIBAL MO
— 573-249 none assigned yet which blocks → FARBER TEL. CO. 1876 FARBER MO
— 573-251 0XXX1XXX2XXX5XXX7XXX · 4 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 FREMONT MO
— 573-252 none assigned yet which blocks → KINGDOM TEL. CO. 1901 BIGSPRING MO
— 573-254 none assigned yet which blocks → KINGDOM TEL. CO. 1901 WILLIAMSBG MO
— 573-255 0XXX1XXX2XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → WINDSTREAM MISSOURI, INC. 1885 PONDER MO
— 573-256 9XXX which blocks → BRIGHTSPEED OF MISSOURI, LLC 9784 COLUMBIA MO
— 573-257 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H JEFFERSNCY MO
— 573-258 3XXX4XXX5XXX8XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SIKESTON MO
— 573-259 4XXX5XXX6XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CUBA MO
— 573-261 3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 ST JAMES MO
— 573-262 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 ORAN MO
— 573-263 2XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ST JAMES MO
— 573-264 0XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 SCOTT CITY MO
— 573-265 9XXX which blocks → BRIGHTSPEED OF MISSOURI, LLC 9787 ST JAMES MO
— 573-266 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 OAK RIDGE MO
— 573-267 0XXX2XXX4XXX5XXX6XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 CENTER MO
— 573-268 none assigned yet which blocks → T-MOBILE USA, INC. 6529 COLUMBIA MO
— 573-269 0XXX2XXX3XXX5XXX9XXX · 4 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 OATES MO
— 573-270 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 CAPEGIRARD MO
— 573-271 2XXX3XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 CAPEGIRARD MO
— 573-272 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 SIKESTON MO
— 573-276 0XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 MALDEN MO
— 573-278 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 CAPEGIRARD MO
— 573-280 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LKOZKOSBCH MO
— 573-283 0XXX2XXX3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 ESSEX MO
— 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

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.