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
— 319-750 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 BURLINGTON IA
— 319-752 not yet reported which blocks → QWEST CORPORATION 9631 BURLINGTON IA
— 319-753 not yet reported which blocks → QWEST CORPORATION 9631 BURLINGTON IA
— 319-754 not yet reported which blocks → QWEST CORPORATION 9631 BURLINGTON IA
— 319-758 not yet reported which blocks → QWEST CORPORATION 9631 BURLINGTON IA
— 319-759 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 BURLINGTON IA
— 319-766 0XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 OAKVILLE IA
— 319-768 6XXX7XXX8XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9631 BURLINGTON IA
— 319-784 7XXX8XXX which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-786 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-790 none assigned yet which blocks → PAETEC ITEL, LLC 829J CEDAR RPDS IA
— 319-795 9XXX which blocks → UNITED STATES CELLULAR - IA 6266 KEOKUK IA
— 319-796 not yet reported which blocks → VAN BUREN TEL. CO., INC. 1319 STOCKPORT IA
— 319-800 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 IOWA CITY IA
— 319-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IA
— 319-821 not yet reported which blocks → T-MOBILE USA, INC. 6529 ANAMOSA IA
— 319-822 not yet reported which blocks → DUNKERTON TEL. COOP. 1153 DUNKERTON IA
— 319-824 7XXX8XXX · 2 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 GRUNDY CTR IA
— 319-825 not yet reported which blocks → AUREON COMMUNICATIONS, LLC 444G GRUNDY CTR IA
— 319-827 none assigned yet which blocks → FARMERS MUTUAL TEL. CO. 1171 JESUP IA
— 319-828 not yet reported which blocks → SOUTH SLOPE COOPERATIVE TELEPHONE COMPANY - IA 562E OXFORD IA
— 319-830 8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 WATERLOO IA
— 319-832 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-833 not yet reported which blocks → QWEST CORPORATION 9631 WATERLOO IA
— 319-834 0XXX9XXX which blocks → QWEST CORPORATION 9631 IOWA CITY IA
— 319-835 2XXX4XXX6XXX8XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 DONNELLSON IA
— 319-836 0XXX3XXX7XXX8XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 PRIMROSE IA
— 319-837 3XXX4XXX5XXX7XXX9XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 WEST POINT IA
— 319-838 5XXX6XXX7XXX · 2 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 ARGYLE IA
— 319-841 not yet reported which blocks → SOUTH SLOPE COOP. TEL. CO., INC. 1298 ELY IA
— 319-842 not yet reported which blocks → FARMERS MUTUAL TEL. CO. 1173 ALBURNETT IA
— 319-845 not yet reported which blocks → SOUTH SLOPE COOP. TEL. CO., INC. 1298 FAIRFAX IA
— 319-846 not yet reported which blocks → SOUTH SLOPE COOP. TEL. CO., INC. 1298 FAIRFAX IA
— 319-848 not yet reported which blocks → SOUTH SLOPE COOP. TEL. CO., INC. 1298 ELY IA
— 319-849 0XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9631 CENTER PT IA
— 319-850 4XXX5XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 BURLINGTON IA
— 319-851 not yet reported which blocks → PALO COOP. TEL. ASSN. 1269 PALO IA
— 319-854 not yet reported which blocks → SPRINGVILLE COOP. TEL. ASSN., INC. 1302 SPRINGVL IA
— 319-857 not yet reported which blocks → SOUTH SLOPE COOP. TEL. CO., INC. 1298 SWISHER IA
— 319-859 4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9631 CEDARFALLS IA
— 319-861 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-862 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-863 4XXX5XXX6XXX · 2 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 WASHINGTON IA
— 319-865 0XXX2XXX6XXX8XXX9XXX · 2 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 MOUNTUNION IA
— 319-866 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-868 8XXX which blocks → MUTUAL TEL. CO. OF MORNING SUN 1250 MORNINGSUN IA
— 319-874 not yet reported which blocks → QWEST CORPORATION 9631 WATERLOO IA
— 319-878 0XXX2XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 FARMINGTON IA
— 319-882 not yet reported which blocks → BUTLER-BREMER MUTUAL TEL. CO. 1115 TRIPOLI IA
— 319-885 not yet reported which blocks → BUTLER-BREMER MUTUAL TEL. CO. 1115 SHELL ROCK 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.