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
Download CSV ↓
Quick find in this area code:
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 563-206 0–9 XXXall 10 · 8 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J CLINTON IA
— 563-208 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - IA 221F MUSCATINE IA
— 563-210 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 DAVENPORT IA
— 563-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IA
— 563-212 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 CLINTON IA
— 563-213 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 DUBUQUE IA
— 563-219 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - IA 985E CLINTON IA
— 563-225 not yet reported which blocks → CENTRAL SCOTT TEL. 1125 MCCAUSLAND IA
— 563-237 0XXX2XXX3XXX4XXX7XXX8XXX · 5 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 FREDECKSBG IA
— 563-238 0XXX4XXX6XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 LAWLER IA
— 563-241 2XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9631 CLINTON IA
— 563-242 not yet reported which blocks → QWEST CORPORATION 9631 CLINTON IA
— 563-243 not yet reported which blocks → QWEST CORPORATION 9631 CLINTON IA
— 563-244 not yet reported which blocks → QWEST CORPORATION 9631 CLINTON IA
— 563-245 5XXX which blocks → ALPINE COMMUNICATIONS, L.C. 1106 ELKADER IA
— 563-246 not yet reported which blocks → F&B COMMUNICATIONS, INC. 1160 CALAMUS IA
— 563-249 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 CLINTON IA
— 563-252 6XXX which blocks → ALPINE COMMUNICATIONS, L.C. 1106 GUTTENBERG IA
— 563-255 not yet reported which blocks → ALPINE COMMUNICATIONS, L.C. 1106 GARBER IA
— 563-259 5XXX6XXX7XXX · 3 holders which blocks → QWEST CORPORATION 9631 CLINTON IA
— 563-260 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 MUSCATINE IA
— 563-262 not yet reported which blocks → QWEST CORPORATION 9631 MUSCATINE IA
— 563-263 not yet reported which blocks → QWEST CORPORATION 9631 MUSCATINE IA
— 563-264 not yet reported which blocks → QWEST CORPORATION 9631 MUSCATINE IA
— 563-271 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 DAVENPORT IA
— 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

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.