NumberResearch Membership · Data 09/30/2026

Recent prefix assignments

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

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
Rogers Communications Canada Inc. (Wireless) 46
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 27
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
New assignments by month Oct 2026 Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 572-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 572-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 572-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST OK
— 572-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 572-700 not yet reported which blocks → OK
— 572-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 572-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 572-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 572-950 not yet reported which blocks → OK
— 572-958 not yet reported which blocks → OK
— 572-959 not yet reported which blocks → OK
— 572-976 not yet reported which blocks → OK
— 573-204 3XXX4XXX5XXX6XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 JACKSON MO
— 573-209 not yet reported which blocks → MARK TWAIN COMMUNICATIONS 8953 EWING MO
— 573-210 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 POTOSI MO
— 573-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MO
— 573-212 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 ORAN MO
— 573-214 1XXX which blocks → BRIGHTSPEED OF MISSOURI, LLC 9784 COLUMBIA MO
— 573-215 not yet reported which blocks → MARK TWAIN COMMUNICATIONS 8953 LEWISTOWN MO
— 573-216 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LKOZKOSBCH MO
— 573-218 0XXX2XXX3XXX4XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 FARMINGTON MO
— 573-219 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 COLUMBIA MO
— 573-220 8XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FULTON MO
— 573-221 not yet reported which blocks → SOUTHWESTERN BELL 9533 HANNIBAL MO
— 573-222 0XXX4XXX5XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 PUXICO MO
— 573-223 5XXX8XXX · 2 holders which blocks → WINDSTREAM MISSOURI, INC. 1885 PIEDMONT MO
— 573-224 1XXX2XXX4XXX8XXX · 2 holders which blocks → WINDSTREAM MISSOURI, INC. 1885 GREENVILLE MO
— 573-225 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CAPEGIRARD MO
— 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

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/30/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.