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 319
QWEST CORPORATION 99
UNITED STATES CELLULAR - IA 39
T-MOBILE USA, INC. 39
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 39
WINDSTREAM IOWA COMMUNICATIONS, INC. 37
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
2006-04-21 319-585 2XXX3XXX5XXX8XXX · 3 holders which blocks → MCC TELEPHONY LLC 593K HAZLETON IA
2006-04-21 319-652 1XXX3XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → MCC TELEPHONY LLC 593K TRAER IA
2006-04-21 319-677 1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 KEOSAUQUA IA
2006-04-03 319-332 0–9 XXXall 10 · 5 holders which blocks → INDEPENDENCE TELECOMMUNICATIONS UTILITY - IA 649D INDEPNDNCE IA
2006-03-28 319-543 0XXX3XXX4XXX5XXX7XXX · 5 holders which blocks → MCC TELEPHONY LLC 593K SOLON IA
2006-03-28 319-633 0XXX3XXX4XXX6XXX · 4 holders which blocks → MCC TELEPHONY LLC 593K LONE TREE IA
2005-11-11 319-288 7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 KEOSAUQUA IA
2005-04-26 319-327 0–9 XXXall 10 · 4 holders which blocks → UNITED STATES CELLULAR - IA 6266 INDEPNDNCE IA
2005-03-08 319-355 0–9 XXXwhole prefix which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
2004-11-24 319-214 0–9 XXXall 10 · 4 holders which blocks → MCC TELEPHONY LLC 593K VINTON IA
2004-07-14 319-213 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CEDAR RPDS IA
2004-05-13 319-202 not yet reported which blocks → T-MOBILE USA, INC. 6529 CEDAR RPDS IA
2004-02-04 319-238 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - IA 221F OELWEIN IA
2004-01-19 319-215 0–9 XXXall 10 · 3 holders which blocks → UNITED STATES CELLULAR - IA 6266 WATERLOO IA
2003-07-17 319-823 1XXX3XXX6XXX8XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 GRUNDY CTR IA
2003-04-10 319-212 2XXX3XXX4XXX5XXX6XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 COLUMBSJCT IA
2003-03-25 319-208 1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J BURLINGTON IA
2003-02-06 319-217 3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 MTPLEASANT IA
2002-04-22 319-243 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9631 CEDARFALLS IA
2002-04-16 319-255 0–9 XXXall 10 · 2 holders which blocks → LOCAL TELEPHONE DATA SERVICES CORP. 2842 COLUMBSJCT IA
2002-03-28 319-242 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → AT&T - LOCAL 7421 CEDARFALLS IA
2002-03-07 319-237 2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → LOCAL TELEPHONE DATA SERVICES CORP. 2842 BURLINGTON IA
2002-03-07 319-241 not yet reported which blocks → T-MOBILE USA, INC. 6529 CEDAR RPDS IA
2002-02-12 319-210 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 CEDAR RPDS IA
2001-11-29 319-788 not yet reported which blocks → REINBECK MUNICIPAL TELECOMMUNICATIONS UTILITY - IA 9129 REINBECK IA
2001-09-12 319-406 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → AT&T - LOCAL 7421 DENVER IA
2001-07-11 319-614 1XXX2XXX4XXX6XXX7XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PACKWOOD IA
2001-06-14 319-610 6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WATERLOO IA
2001-06-05 319-669 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FT MADISON IA
2001-06-05 319-670 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KEOKUK IA
2001-06-05 319-671 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → AUREON COMMUNICATIONS, LLC 444G BURLINGTON IA
2001-05-30 319-473 not yet reported which blocks → T-MOBILE USA, INC. 6529 KEOKUK IA
2001-05-30 319-537 not yet reported which blocks → T-MOBILE USA, INC. 6529 MTPLEASANT IA
2001-05-30 319-561 not yet reported which blocks → T-MOBILE USA, INC. 6529 FT MADISON IA
2001-05-25 319-598 none assigned yet which blocks → LOCAL TELEPHONE DATA SERVICES CORP. 2842 WASHINGTON IA
2001-04-10 319-209 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 BURLINGTON IA
2001-03-27 319-415 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 WATERLOO IA
2001-03-09 319-325 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 IOWA CITY IA
2001-02-09 319-601 2XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 BURLINGTON IA
2001-01-19 319-400 5XXX6XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 IOWA CITY IA
2001-01-19 319-573 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CEDAR RPDS IA
— 319-201 0–9 XXXall 10 · 6 holders which blocks → UNITED STATES CELLULAR - IA 6266 MTPLEASANT IA
— 319-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IA
— 319-219 4XXX5XXX6XXX7XXX8XXX which blocks → LOCAL TELEPHONE DATA SERVICES CORP. 2842 MTPLEASANT IA
— 319-221 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-222 1XXX3XXX4XXX5XXX · 4 holders which blocks → QWEST CORPORATION 9631 CEDARFALLS IA
— 319-223 not yet reported which blocks → SOUTH SLOPE COOP. TEL. CO., INC. 1298 NEWHALL IA
— 319-224 0XXX2XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 TROY MILLS IA
— 319-226 not yet reported which blocks → QWEST CORPORATION 9631 WATERLOO IA
— 319-227 not yet reported which blocks → SOUTH SLOPE COOP. TEL. CO., INC. 1298 NORWAY IA

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.