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
2009-12-21 574-200 0–9 XXXall 10 · 7 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WINAMAC IN
2009-12-01 574-341 0XXX1XXX2XXX3XXX4XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PLYMOUTH IN
2009-11-16 574-635 0–9 XXXall 10 · 6 holders which blocks → AT&T ENTERPRISES, LLC 516C CULVER IN
2009-09-09 574-316 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - IN 105F PLYMOUTH IN
2008-12-05 574-335 0–9 XXXall 10 · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
2008-11-05 574-747 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ELKHART IN
2008-10-23 574-307 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLC - IN 097D SOUTH BEND IN
2008-10-21 574-440 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SOUTH BEND IN
2008-09-02 574-398 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 LOGANSPORT IN
2008-03-13 574-350 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 ELKHART IN
2008-03-07 574-387 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SOUTH BEND IN
2007-11-30 574-348 0XXX1XXX2XXX3XXX6XXX7XXX8XXX · 6 holders which blocks → MCC TELEPHONY OF THE MID-WEST, LLC - IN 874F HAMLET IN
2006-11-15 574-485 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - IN 097D SOUTH BEND IN
2006-09-11 574-343 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ELKHART IN
2006-09-11 574-767 0XXX1XXX2XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 PLYMOUTH IN
2006-07-28 574-641 not yet reported which blocks → COMMUNICATIONS VENTURE CORP DBA INDIGITAL TELECOM 4169 MILLERSBG IN
2006-04-28 574-344 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 SOUTH BEND IN
2006-03-22 574-688 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → MCC TELEPHONY OF THE MID-WEST, LLC - IN 874F PIERCETON IN
2006-03-20 574-678 6XXX7XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 MILFORD IN
2006-03-20 574-804 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → MCC TELEPHONY OF THE MID-WEST, LLC - IN 874F NO LIBERTY IN
2006-03-03 574-878 7XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IN 4803 NO WEBSTER IN
2006-02-06 574-855 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SOUTH BEND IN
2006-01-25 574-992 1XXX2XXX8XXX9XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J LOGANSPORT IN
2006-01-12 574-742 0–9 XXXall 10 · 7 holders which blocks → AT&T ENTERPRISES, LLC 516C OSCEOLA IN
2005-11-21 574-312 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 GOSHEN IN
2005-09-22 574-696 1XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IN 4803 MILFORD IN
2005-08-31 574-988 0XXX8XXX9XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J NEWCARLISL IN
2005-08-30 574-377 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 LEESBURG IN
2005-08-29 574-333 0–9 XXXall 10 · 3 holders which blocks → COMMUNICATIONS VENTURE CORP DBA INDIGITAL TELECOM 4169 ELKHART IN
2005-07-13 574-622 0XXX1XXX2XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J BRISTOL IN
2005-02-15 574-330 1XXX3XXX4XXX5XXX7XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IN 4803 MILLERSBG IN
2005-02-15 574-797 1XXX3XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IN 4803 NEWCARLISL IN
2005-01-27 574-933 0–9 XXXall 10 · 3 holders which blocks → COMMUNICATIONS VENTURE CORP DBA INDIGITAL TELECOM 4169 PLYMOUTH IN
2005-01-06 574-655 5XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IN 4803 FLORA IN
2004-11-04 574-808 0–9 XXXall 10 · 8 holders which blocks → T-MOBILE USA, INC. 6529 MONTICELLO IN
2004-04-29 574-313 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IN 4803 FLORA IN
2004-04-06 574-325 0XXX1XXX2XXX3XXX5XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IN 4803 SYRACUSE IN
2004-02-06 574-308 not yet reported which blocks → FBN INDIANA, INC. - IN 4117 NEWCARLISL IN
2004-02-06 574-324 not yet reported which blocks → FBN INDIANA, INC. - IN 4117 NO LIBERTY IN
2004-02-06 574-362 not yet reported which blocks → FBN INDIANA, INC. - IN 4117 MILLERSBG IN
2003-11-26 574-355 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → METROPCS, INC. 5562 LOGANSPORT IN
2003-11-26 574-356 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 NAPPANEE IN
2003-10-30 574-309 0–9 XXXall 10 · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 SOUTH BEND IN
2003-06-04 574-302 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SOUTH BEND IN
2003-06-04 574-303 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 SOUTH BEND IN
2003-05-01 574-322 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 ELKHART IN
2003-04-29 574-310 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 SOUTH BEND IN
2003-03-21 574-301 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 BREMEN IN
2003-01-22 574-354 3XXX4XXX5XXX6XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 NAPPANEE IN
2002-11-12 574-647 0–9 XXXwhole prefix 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.