Recent prefix assignments
347 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/29/2026
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.
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| — | 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.