NumberResearch Membership · Data 09/26/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/26/2026

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 317
INDIANA BELL TEL CO INC 297
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
— 317-761 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-767 1XXX4XXX5XXX9XXX which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-770 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 NOBLESVL IN
— 317-773 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 NOBLESVL IN
— 317-774 4XXX5XXX6XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 NOBLESVL IN
— 317-776 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 NOBLESVL IN
— 317-780 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-781 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-782 5XXX which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-783 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-784 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-786 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-787 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 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
— 317-802 1XXX7XXX which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS 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
— 317-821 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
— 317-826 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 OAKLANDON IN
— 317-831 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 MOORESVL 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
— 317-837 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
— 317-841 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
— 317-852 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 BROWNSBURG IN
— 317-856 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 WESTNEWTON IN
— 317-858 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 BROWNSBURG IN
— 317-859 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 GREENWOOD IN
— 317-861 7XXX which blocks → INDIANA BELL TEL CO INC 9325 NEWPALSTIN IN
— 317-862 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 ACTON IN
— 317-865 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 GREENWOOD IN
— 317-869 2XXX3XXX5XXX6XXX7XXX8XXX9XXX which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-870 1XXX3XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN
— 317-871 1XXX4XXX which blocks → INDIANA BELL TEL CO INC 9325 INDIANAPLS IN

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/26/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.