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 563
QWEST CORPORATION 54
UNITED STATES CELLULAR - IA 33
WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 26
T-MOBILE USA, INC. 25
WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 22
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
— 563-282 not yet reported which blocks → CENTRAL SCOTT TEL. 1125 DONAHUE IA
— 563-284 0XXX1XXX2XXX3XXX7XXX · 5 holders which blocks → QWEST CORPORATION 9631 WALCOTT IA
— 563-285 not yet reported which blocks → CENTRAL SCOTT TEL. 1125 ELDRIDGE IA
— 563-288 5XXX which blocks → QWEST CORPORATION 9631 MUSCATINE IA
— 563-289 7XXX8XXX · 2 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 LE CLAIRE IA
— 563-297 3XXX6XXX · 2 holders which blocks → ONVOY, LLC - IA 221F ARLINGTON IA
— 563-299 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 MUSCATINE IA
— 563-309 not yet reported which blocks → IA
— 563-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IA
— 563-319 not yet reported which blocks → IA
— 563-320 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 DAVENPORT IA
— 563-322 not yet reported which blocks → QWEST CORPORATION 9631 DAVENPORT IA
— 563-323 not yet reported which blocks → QWEST CORPORATION 9631 DAVENPORT IA
— 563-324 not yet reported which blocks → QWEST CORPORATION 9631 DAVENPORT IA
— 563-326 not yet reported which blocks → QWEST CORPORATION 9631 DAVENPORT IA
— 563-327 not yet reported which blocks → QWEST CORPORATION 9631 DAVENPORT IA
— 563-328 not yet reported which blocks → QWEST CORPORATION 9631 DAVENPORT IA
— 563-332 not yet reported which blocks → QWEST CORPORATION 9631 DAVENPORT IA
— 563-333 not yet reported which blocks → QWEST CORPORATION 9631 DAVENPORT IA
— 563-336 not yet reported which blocks → QWEST CORPORATION 9631 DAVENPORT IA
— 563-340 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 DAVENPORT IA
— 563-343 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 DAVENPORT IA
— 563-344 not yet reported which blocks → QWEST CORPORATION 9631 DAVENPORT IA
— 563-349 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 DAVENPORT IA
— 563-355 not yet reported which blocks → QWEST CORPORATION 9631 DAVENPORT IA
— 563-357 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 CLINTON IA
— 563-359 not yet reported which blocks → QWEST CORPORATION 9631 DAVENPORT IA
— 563-370 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 DAVENPORT IA
— 563-374 not yet reported which blocks → F&B COMMUNICATIONS, INC. 1160 WHEATLAND IA
— 563-379 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 DECORAH IA
— 563-380 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 DECORAH IA
— 563-381 0XXX7XXX · 2 holders which blocks → QWEST CORPORATION 9631 DAVENPORT IA
— 563-382 not yet reported which blocks → QWEST CORPORATION 9631 DECORAH IA
— 563-383 not yet reported which blocks → QWEST CORPORATION 9631 DAVENPORT IA
— 563-386 not yet reported which blocks → QWEST CORPORATION 9631 DAVENPORT IA
— 563-387 6XXX7XXX8XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9631 DECORAH IA
— 563-388 not yet reported which blocks → QWEST CORPORATION 9631 DAVENPORT IA
— 563-391 not yet reported which blocks → QWEST CORPORATION 9631 DAVENPORT IA
— 563-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IA
— 563-419 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 DECORAH IA
— 563-421 none assigned yet which blocks → QWEST CORPORATION 9631 DAVENPORT IA
— 563-422 0XXX1XXX2XXX4XXX7XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9631 WEST UNION IA
— 563-423 not yet reported which blocks → ACE TEL. ASSN. - IA 1346 CLERMONT IA
— 563-425 6XXX7XXX8XXX9XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 FAYETTE IA
— 563-426 not yet reported which blocks → ALPINE COMMUNICATIONS, L.C. 1106 ELGIN IA
— 563-427 not yet reported which blocks → HAWKEYE TEL. CO. 1199 HAWKEYE IA
— 563-428 2XXX3XXX5XXX6XXX7XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 RANDALIA IA
— 563-429 4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 ALPHA IA
— 563-432 not yet reported which blocks → MECHANICSVILLE TEL. CO. 1241 MECHANCSVL IA
— 563-441 not yet reported which blocks → QWEST CORPORATION 9631 DAVENPORT 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.