NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026
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
New assignments by month
Sep 2026
Aug 2026
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May 2026
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Dec 2025
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Oct 2025
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| — | 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 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.