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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 319-489 not yet reported which blocks → OLIN TEL. CO., INC. 1264 MORLEY IA
— 319-491 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → AT&T - LOCAL 7421 CEDAR RPDS IA
— 319-493 2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 WATERLOO IA
— 319-494 not yet reported which blocks → VAN BUREN TEL. CO., INC. 1319 MTSTERLING IA
— 319-498 not yet reported which blocks → VAN BUREN TEL. CO., INC. 1319 BIRMINGHAM IA
— 319-504 none assigned yet which blocks → T-MOBILE USA, INC. 6529 WATERLOO IA
— 319-509 not yet reported which blocks → T-MOBILE USA, INC. 6529 OELWEIN IA
— 319-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IA
— 319-512 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 IOWA CITY IA
— 319-520 1XXX2XXX3XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 KEOKUK IA
— 319-521 not yet reported which blocks → T-MOBILE USA, INC. 6529 CEDAR RPDS IA
— 319-523 7XXX which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 WAPELLO IA
— 319-524 not yet reported which blocks → QWEST CORPORATION 9631 KEOKUK IA
— 319-525 not yet reported which blocks → COOPERATIVE TEL. CO. 1139 HARTWICK IA
— 319-526 0XXX1XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9631 KEOKUK IA
— 319-527 8XXX which blocks → LOUISA COMMUNICATIONS, LC - IA 4650 WAPELLO IA
— 319-528 2XXX3XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 DENMARK IA
— 319-530 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 IOWA CITY IA
— 319-531 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 CEDAR RPDS IA
— 319-533 none assigned yet which blocks → T-MOBILE USA, INC. 6529 CEDAR RPDS IA
— 319-540 7XXX8XXX9XXX · 2 holders which blocks → UNITED STATES CELLULAR - IA 6266 CEDAR RPDS IA
— 319-541 8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 IOWA CITY IA
— 319-545 not yet reported which blocks → SOUTH SLOPE COOPERATIVE TELEPHONE COMPANY - IA 562E TIFFIN IA
— 319-548 not yet reported which blocks → T-MOBILE USA, INC. 6529 WASHINGTON IA
— 319-550 0XXX9XXX which blocks → UNITED STATES CELLULAR - IA 6266 CEDAR RPDS IA
— 319-551 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 CEDAR RPDS IA
— 319-553 5XXX6XXX8XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J CEDARFALLS IA
— 319-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST IA
— 319-558 6XXX7XXX8XXX9XXX which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-560 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 CEDAR RPDS IA
— 319-572 8XXX which blocks → UNITED STATES CELLULAR - IA 6266 BURLINGTON IA
— 319-575 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - IA 221F CEDARFALLS IA
— 319-576 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J BURLINGTON IA
— 319-591 0XXX1XXX2XXX3XXX6XXX8XXX9XXX · 4 holders which blocks → UNITED STATES CELLULAR - IA 6266 WASHINGTON IA
— 319-592 not yet reported which blocks → VAN BUREN TEL. CO., INC. 1319 BONAPARTE IA
— 319-594 0XXX2XXX which blocks → T-MOBILE USA, INC. 6529 IOWA CITY IA
— 319-596 2XXX3XXX4XXX5XXX6XXX8XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J WAVERLY IA
— 319-602 6XXX8XXX · 2 holders which blocks → ONVOY, LLC - IA 221F HUDSON IA
— 319-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IA
— 319-621 none assigned yet which blocks → T-MOBILE USA, INC. 6529 IOWA CITY IA
— 319-622 not yet reported which blocks → SOUTH SLOPE COOP. TEL. CO., INC. 1298 AMANA IA
— 319-623 not yet reported which blocks → COOPERATIVE TEL. CO. 1139 LADORA IA
— 319-624 not yet reported which blocks → SOUTH SLOPE COOPERATIVE TELEPHONE COMPANY - IA 562E SOLON IA
— 319-625 not yet reported which blocks → SOUTH SLOPE COOP. TEL. CO., INC. 1298 NO LIBERTY IA
— 319-626 not yet reported which blocks → SOUTH SLOPE COOP. TEL. CO., INC. 1298 NO LIBERTY IA
— 319-627 not yet reported which blocks → WEST LIBERTY TEL. CO. 1332 W LIBERTY IA
— 319-628 0XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 OXFORD IA
— 319-629 2XXX3XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 LONE TREE IA
— 319-631 7XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 IOWA CITY IA
— 319-632 not yet reported which blocks → SOUTH SLOPE COOP. TEL. CO., INC. 1298 NO LIBERTY 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.