NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

1 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, last 30 days — NPA 317
OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 1
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
— 317-788 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-789 5XXX6XXX7XXX8XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-791 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-796 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
— 317-797 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
— 317-802 1XXX7XXX which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-803 0XXX1XXX5XXX6XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J INDIANAPLS IN
— 317-804 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 WESTFIELD IN
— 317-805 not yet reported which blocks → LEVEL 3 TELECOM OF INDIANA, LP - IN 7060 CARMEL IN
— 317-806 9XXX which blocks → LEVEL 3 TELECOM OF INDIANA, LP - IN 7060 FISHERS IN
— 317-807 6XXX which blocks → PAETEC ITEL, LLC 829J GREENWOOD IN
— 317-808 not yet reported which blocks → PAETEC ITEL, LLC 829J INDIANAPLS IN
— 317-810 1XXX3XXX4XXX6XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 CARMEL IN
— 317-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IN
— 317-813 9XXX which blocks → PAETEC ITEL, LLC 829J FISHERS IN
— 317-814 9XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 CARMEL IN
— 317-815 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 CARMEL IN
— 317-816 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 CARMEL IN
— 317-817 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 CARMEL IN
— 317-818 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 CARMEL IN
— 317-819 not yet reported which blocks → PAETEC ITEL, LLC 829J CARMEL IN
— 317-821 7XXX which blocks → INDIANA BELL TEL CO INC 9325 WESTNEWTON IN
— 317-822 1XXX7XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-823 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 OAKLANDON IN
— 317-824 9XXX which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-825 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IN 4803 SHELBYVL IN
— 317-826 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 OAKLANDON IN
— 317-828 2XXX3XXX4XXX5XXX7XXX8XXX which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 INDIANAPLS IN
— 317-829 1XXX3XXX4XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 INDIANAPLS IN
— 317-830 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 WESTNEWTON IN
— 317-831 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 MOORESVL IN
— 317-833 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → LEVEL 3 TELECOM OF INDIANA, LP - IN 7060 INDIANAPLS IN
— 317-834 7XXX which blocks → INDIANA BELL TEL CO INC 9325 MOORESVL IN
— 317-835 1XXX3XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → INDIANA BELL TEL CO INC 9325 FAIRLAND IN
— 317-836 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IN 4803 SHERIDAN IN
— 317-837 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 PLAINFIELD IN
— 317-838 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 PLAINFIELD IN
— 317-839 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 PLAINFIELD IN
— 317-840 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
— 317-841 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 FISHERS IN
— 317-842 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 FISHERS IN
— 317-843 6XXX which blocks → INDIANA BELL TEL CO INC 9325 CARMEL IN
— 317-844 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 CARMEL IN
— 317-845 6XXX which blocks → INDIANA BELL TEL CO INC 9325 FISHERS IN
— 317-846 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 CARMEL IN
— 317-848 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 CARMEL IN
— 317-849 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 FISHERS IN
— 317-850 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
— 317-851 0XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 GREENWOOD IN
— 317-852 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 BROWNSBURG IN

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.