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 574
INDIANA BELL TEL CO INC 43
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
2008-12-05 574-335 0–9 XXXall 10 · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
2002-11-12 574-647 0–9 XXXwhole prefix which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-231 6XXX7XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-232 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-233 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-234 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-235 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-236 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-237 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-239 5XXX which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-243 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-245 0XXX which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-246 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-247 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-251 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-252 1XXX6XXX9XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-254 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-255 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-256 8XXX which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-257 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-258 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-259 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-271 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-272 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-273 7XXX which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-277 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-280 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-282 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-283 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-284 8XXX which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-287 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-288 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-289 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-291 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-299 3XXX6XXX which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-472 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-631 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-634 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-651 7XXX8XXX9XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 OSCEOLA IN
— 574-674 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 OSCEOLA IN
— 574-675 1XXX6XXX which blocks → INDIANA BELL TEL CO INC 9325 OSCEOLA IN
— 574-679 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 OSCEOLA IN
— 574-842 0XXX1XXX6XXX9XXX · 3 holders which blocks → INDIANA BELL TEL CO INC 9325 CULVER 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.