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
2020-04-29 574-766 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → FRACTEL, LLC 965H CLAYPOOL IN
2019-09-18 574-346 0–9 XXXall 10 · 2 holders which blocks → PEERLESS NETWORK OF INDIANA, LLC - IN 279F ELKHART IN
2019-09-17 574-710 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H SOUTH BEND IN
2019-07-17 574-465 0–9 XXXall 10 · 2 holders which blocks → FRACTEL, LLC 965H ROYAL CTR IN
2019-05-08 574-544 0–9 XXXall 10 · 7 holders which blocks → COMMIO, LLC 939H SOUTH BEND IN
2019-03-15 574-600 0XXX1XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H CULVER IN
2019-01-25 574-500 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H GOSHEN IN
2019-01-25 574-666 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H SOUTH BEND IN
2019-01-25 574-900 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H WAKARUSA IN
2018-12-21 574-888 0–9 XXXall 10 · 5 holders which blocks → TERRA NOVA TELECOM INC. 145J SOUTH BEND IN
2018-11-08 574-336 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 LOGANSPORT IN
2018-09-21 574-564 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - IN 097D ELKHART IN
2018-09-19 574-475 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - IN 097D LUCERNE IN
2018-04-04 574-345 0–9 XXXall 10 · 5 holders which blocks → VONAGE AMERICA LLC 197D SOUTH BEND IN
2017-10-27 574-338 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J ELKHART IN
2017-09-29 574-800 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - IN 097D SOUTH BEND IN
2017-08-31 574-777 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - IN 097D OSCEOLA IN
2017-02-10 574-999 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - IN 097D SOUTH BEND IN
2016-09-12 574-373 0–9 XXXall 10 · 5 holders which blocks → BRIGHTSPEED OF INDIANA, LLC 0832 WARSAW IN
2016-07-07 574-393 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 SOUTH BEND IN
2016-06-24 574-402 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 SOUTH BEND IN
2016-06-09 574-413 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 SOUTH BEND IN
2016-03-22 574-319 0–9 XXXwhole prefix which blocks → ONVOY, LLC - IN 097D TWELVEMILE IN
2015-11-17 574-444 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - IN 097D OSCEOLA IN
2014-12-17 574-406 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - IN 097D SOUTH BEND IN
2014-12-16 574-314 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 SOUTH BEND IN
2014-12-15 574-347 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 SOUTH BEND IN
2014-07-07 574-701 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J GALVESTON IN
2014-06-27 574-404 0–9 XXXall 10 · 6 holders which blocks → PAETEC ITEL, LLC 829J SOUTH BEND IN
2014-03-03 574-218 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ELKHART IN
2013-11-14 574-704 3XXX7XXX · 2 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J PLYMOUTH IN
2013-11-05 574-703 0–9 XXXall 10 · 4 holders which blocks → AT&T ENTERPRISES, LLC 516C SOUTH BEND IN
2013-10-14 574-240 0–9 XXXall 10 · 7 holders which blocks → PULASKI-WHITE RURAL TELEPHONE COOPERATIVE, INC. 204H MONTICELLO IN
2013-04-26 574-327 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ELKHART IN
2012-11-08 574-401 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 551G SOUTH BEND IN
2012-10-08 574-334 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 SOUTH BEND IN
2012-09-27 574-318 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - IN 105F SOUTH BEND IN
2012-04-10 574-213 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - IN 105F SOUTH BEND IN
2011-11-16 574-201 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROCHESTER IN
2011-07-22 574-326 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ELKHART IN
2011-06-14 574-290 1XXX2XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KEWANNA IN
2011-05-31 574-222 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J SOUTH BEND IN
2010-12-20 574-400 0–9 XXXall 10 · 7 holders which blocks → MCC TELEPHONY OF THE MID-WEST, LLC - IN 874F SOUTH BEND IN
2010-11-29 574-300 0–9 XXXwhole prefix which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 SOUTH BEND IN
2010-08-03 574-364 0–9 XXXall 10 · 6 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 GOSHEN IN
2010-06-17 574-363 0XXX1XXX2XXX3XXX4XXX6XXX7XXX · 6 holders which blocks → MCC TELEPHONY OF THE MID-WEST, LLC - IN 874F BOURBON IN
2010-04-15 574-337 0XXX1XXX3XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → MCC TELEPHONY OF THE MID-WEST, LLC - IN 874F SYRACUSE IN
2010-04-05 574-351 not yet reported which blocks → COMCAST IP PHONE, LLC 318J BURROWS IN
2010-03-29 574-367 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - IN 097D SOUTH BEND IN
2010-02-04 574-349 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 GOSHEN 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.