NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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
TELEPORT COMMUNICATIONS AMERICA, LLC - IN 25
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
2009-12-18 317-593 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 ACTON IN
2007-07-03 317-210 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 MOORESVL IN
2001-11-20 317-622 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 CUMBERLAND IN
2001-06-15 317-561 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 PLAINFIELD IN
— 317-204 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 PLAINFIELD IN
— 317-249 0XXX7XXX8XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 CARMEL IN
— 317-287 4XXX9XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 INDIANAPLS IN
— 317-318 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 GREENFIELD IN
— 317-405 7XXX8XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 INDIANAPLS IN
— 317-491 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 INDIANAPLS IN
— 317-510 not yet reported which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 INDIANAPLS IN
— 317-532 7XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 INDIANAPLS IN
— 317-554 7XXX9XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 INDIANAPLS IN
— 317-558 9XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 FISHERS IN
— 317-610 0XXX1XXX6XXX7XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 INDIANAPLS IN
— 317-612 1XXX4XXX7XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 INDIANAPLS IN
— 317-613 7XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 INDIANAPLS IN
— 317-614 0XXX5XXX7XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 INDIANAPLS IN
— 317-703 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 NOBLESVL IN
— 317-708 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 CARMEL IN
— 317-712 0XXX1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 FISHERS IN
— 317-732 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 ZIONSVILLE IN
— 317-814 9XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 CARMEL IN
— 317-830 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 WESTNEWTON IN
— 317-851 0XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 GREENWOOD IN

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.