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
— 573-760 none assigned yet which blocks → SOUTHWESTERN BELL 9533 FARMINGTON MO
— 573-761 not yet reported which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 JEFFERSNCY MO
— 573-762 5XXX which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 NEWBURG MO
— 573-763 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → BRIGHTSPEED OF MISSOURI, LLC 9787 CHAMOIS MO
— 573-764 0XXX6XXX which blocks → FIDELITY TELEPHONE, LLC 1882 GERALD MO
— 573-765 6XXX which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 RICHLAND MO
— 573-766 0XXX1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 BELGRADE MO
— 573-767 0XXX2XXX3XXX4XXX6XXX7XXX8XXX · 6 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 MONTICELLO MO
— 573-768 3XXX4XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PERRYVILLE MO
— 573-769 1XXX9XXX · 2 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 PALMYRA MO
— 573-770 2XXX3XXX which blocks → ONVOY, LLC - MO 093F MONTICELLO MO
— 573-771 not yet reported which blocks → BRIGHTSPEED OF MISSOURI, LLC 9784 COLUMBIA MO
— 573-772 3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 POPLAR BLF MO
— 573-773 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → ONVOY, LLC - MO 093F PALMYRA MO
— 573-774 not yet reported which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 WAYNESVL MO
— 573-775 not yet reported which blocks → STEELVILLE TEL. EXCH., INC. 1949 STEELVILLE MO
— 573-776 none assigned yet which blocks → SOUTHWESTERN BELL 9533 POPLAR BLF MO
— 573-778 none assigned yet which blocks → SOUTHWESTERN BELL 9533 POPLAR BLF MO
— 573-779 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → BRIGHTSPEED OF EAST MISSOURI, LLC 1151 CALEDONIA MO
— 573-782 none assigned yet which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 RUSSELLVL MO
— 573-784 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 FRANKFORD MO
— 573-785 not yet reported which blocks → SOUTHWESTERN BELL 9533 POPLAR BLF MO
— 573-786 not yet reported which blocks → STEELVILLE TEL. EXCH., INC. 1949 HUZZAH MO
— 573-787 4XXX5XXX7XXX8XXX which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 CLARKSBURG MO
— 573-788 0XXX3XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 OLDAPPLETN MO
— 573-789 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → UNITED STATES CELLULAR - MO 6275 VERSAILLES MO
— 573-791 0XXX2XXX3XXX7XXX · 3 holders which blocks → ONVOY, LLC - MO 093F EDGAR SPG MO
— 573-792 0XXX2XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 HOLCOMB MO
— 573-793 none assigned yet which blocks → WINDSTREAM MISSOURI, INC. 1885 IBERIA MO
— 573-794 3XXX4XXX5XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 DELTA MO
— 573-795 8XXX which blocks → T-MOBILE USA, INC. 6529 HANNIBAL MO
— 573-796 not yet reported which blocks → EMBARQ MISSOURI, INC. DBA CENTURYLINK - MO 1811 CALIFORNIA MO
— 573-797 3XXX4XXX5XXX8XXX which blocks → T-MOBILE USA, INC. 6529 JEFFERSNCY MO
— 573-799 0XXX1XXX2XXX3XXX7XXX8XXX · 5 holders which blocks → VONAGE AMERICA LLC 197D LINN MO
— 573-808 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 COLUMBIA MO
— 573-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MO
— 573-814 8XXX9XXX · 2 holders which blocks → BRIGHTSPEED OF MISSOURI, LLC 9784 COLUMBIA MO
— 573-815 not yet reported which blocks → BRIGHTSPEED OF MISSOURI, LLC 9784 COLUMBIA MO
— 573-817 not yet reported which blocks → BRIGHTSPEED OF MISSOURI, LLC 9784 COLUMBIA MO
— 573-818 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 7 holders which blocks → UNITED STATES CELLULAR - MO 6275 COLUMBIA MO
— 573-819 none assigned yet which blocks → UNITED STATES CELLULAR - MO 6275 COLUMBIA MO
— 573-820 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 DEXTER MO
— 573-821 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JEFFERSNCY MO
— 573-822 none assigned yet which blocks → UNITED STATES CELLULAR - MO 6275 HANNIBAL MO
— 573-824 0XXX2XXX3XXX4XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 ALTEBGFRHN MO
— 573-825 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 COLUMBIA MO
— 573-832 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 VERSAILLES MO
— 573-833 0XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 POCAHONTAS MO
— 573-834 3XXX which blocks → FIDELITY TELEPHONE, LLC 1882 BERGER MO
— 573-835 5XXX6XXX · 2 holders which blocks → NEW FLORENCE TEL. CO., INC. 1927 NEWFLORNCE 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.