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
NEW CINGULAR WIRELESS PCS, LLC - IL 49
FRONTIER NORTH, INC.. - IN 45
INDIANA BELL TEL CO INC 43
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 38
BRIGHTSPEED OF INDIANA, LLC 35
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
— 574-206 3XXX4XXX5XXX6XXX · 2 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 ELKHART IN
— 574-208 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SOUTH BEND IN
— 574-209 4XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BREMEN IN
— 574-210 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SOUTH BEND IN
— 574-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IN
— 574-214 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ELKHART IN
— 574-215 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ELKHART IN
— 574-216 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CULVER IN
— 574-220 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SOUTH BEND IN
— 574-223 not yet reported which blocks → ROCHESTER TEL. CO., INC. 0815 ROCHESTER IN
— 574-224 not yet reported which blocks → ROCHESTER TEL. CO., INC. 0815 ROCHESTER IN
— 574-225 3XXX4XXX5XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WINAMAC IN
— 574-227 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MILLWOOD IN
— 574-229 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 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
— 574-250 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 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
— 574-262 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 ELKHART IN
— 574-264 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 ELKHART IN
— 574-266 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 ELKHART IN
— 574-267 not yet reported which blocks → BRIGHTSPEED OF INDIANA, LLC 0832 WARSAW IN
— 574-268 none assigned yet which blocks → BRIGHTSPEED OF INDIANA, LLC 0832 WARSAW IN
— 574-269 not yet reported which blocks → BRIGHTSPEED OF INDIANA, LLC 0832 WARSAW 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
— 574-274 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 SOUTH BEND IN
— 574-276 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 SOUTH BEND IN
— 574-277 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-278 not yet reported which blocks → PULASKI-WHITE RURAL TEL. COOP., INC. 0813 BUFFALO 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

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.