NumberResearch Membership · Data 09/29/2026

Recent prefix assignments

347 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/29/2026

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, last 30 days
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
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
— 563-522 0XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 LOW MOOR IA
— 563-529 none assigned yet which blocks → T-MOBILE USA, INC. 6529 DAVENPORT IA
— 563-532 not yet reported which blocks → ACE TEL. ASSN. - IA 1346 OSSIAN IA
— 563-534 not yet reported which blocks → ACE TEL. ASSN. - IA 1346 FTATKINSON IA
— 563-535 not yet reported which blocks → ACE TEL. ASSN. - IA 1346 WATERVILLE IA
— 563-536 not yet reported which blocks → NORTHEAST IOWA TEL. CO. 1230 FARMERSBG IA
— 563-538 0XXX1XXX2XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9631 LANSING IA
— 563-539 not yet reported which blocks → NORTHEAST IOWA TEL. CO. 1230 MONONA IA
— 563-543 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 DUBUQUE IA
— 563-544 not yet reported which blocks → ACE TEL. ASSN. - IA 1346 NEW ALBIN IA
— 563-546 not yet reported which blocks → ACE TEL. ASSN. - IA 1346 HIGHLANDVL IA
— 563-547 0XXX8XXX which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 CRESCO IA
— 563-552 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → QWEST CORPORATION 9631 DUBUQUE IA
— 563-554 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 MUSCATINE IA
— 563-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST IA
— 563-556 not yet reported which blocks → QWEST CORPORATION 9631 DUBUQUE IA
— 563-557 not yet reported which blocks → QWEST CORPORATION 9631 DUBUQUE IA
— 563-559 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 CLINTON IA
— 563-562 0XXX1XXX2XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → QWEST CORPORATION 9631 CALMAR IA
— 563-563 not yet reported which blocks → IA
— 563-564 2XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 DUBUQUE IA
— 563-565 7XXX which blocks → CENTURYTEL OF CHESTER, INC. DBA CENTURYLINK 1126 CHESTER IA
— 563-566 3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 LIME SPG IA
— 563-567 not yet reported which blocks → ACE TEL. ASSN. - IA 1346 CASTALIA IA
— 563-568 1XXX7XXX8XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9631 WAUKON IA
— 563-569 0XXX2XXX3XXX4XXX5XXX6XXX7XXX · 6 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 PROTIVIN IA
— 563-570 not yet reported which blocks → T-MOBILE USA, INC. 6529 DAVENPORT IA
— 563-571 not yet reported which blocks → T-MOBILE USA, INC. 6529 MUSCATINE IA
— 563-574 not yet reported which blocks → F&B COMMUNICATIONS, INC. - IA 4245 DELMAR IA
— 563-577 not yet reported which blocks → PRESTON TEL. CO. 1276 GOOSE LAKE IA
— 563-578 6XXX7XXX9XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 SUMNER IA
— 563-579 not yet reported which blocks → T-MOBILE USA, INC. 6529 DAVENPORT IA
— 563-580 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 DUBUQUE IA
— 563-581 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 DUBUQUE IA
— 563-582 not yet reported which blocks → QWEST CORPORATION 9631 DUBUQUE IA
— 563-583 not yet reported which blocks → QWEST CORPORATION 9631 DUBUQUE IA
— 563-584 not yet reported which blocks → QWEST CORPORATION 9631 DUBUQUE IA
— 563-585 not yet reported which blocks → QWEST CORPORATION 9631 DUBUQUE IA
— 563-586 8XXX which blocks → ACE TEL. ASSN. - IA 1346 HARPESFRRY IA
— 563-587 8XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9631 DUBUQUE IA
— 563-588 not yet reported which blocks → QWEST CORPORATION 9631 DUBUQUE IA
— 563-589 not yet reported which blocks → QWEST CORPORATION 9631 DUBUQUE IA
— 563-590 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 DUBUQUE IA
— 563-593 not yet reported which blocks → T-MOBILE USA, INC. 6529 CLINTON IA
— 563-599 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 DUBUQUE IA
— 563-605 3XXX4XXX5XXX6XXX8XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 POSTVILLE IA
— 563-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IA
— 563-633 0XXX7XXX8XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 ARLINGTON IA
— 563-637 4XXX7XXX8XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 MAYNARD IA
— 563-641 not yet reported which blocks → IA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/29/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.