NumberResearchRecent prefix assignments
1 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, last 30 days — NPA 515
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
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| — | 515-233 | not yet reported which blocks → | QWEST CORPORATION | 9631 | AMES | IA |
| — | 515-234 | not yet reported which blocks → | ELECTRONIC ENGINEERING COMPANY | 6753 | DES MOINES | IA |
| — | 515-235 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-237 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-238 | none assigned yet which blocks → | UNITED STATES CELLULAR - IA | 6266 | DES MOINES | IA |
| — | 515-239 | not yet reported which blocks → | QWEST CORPORATION | 9631 | AMES | IA |
| — | 515-240 | not yet reported which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA | 6570 | DES MOINES | IA |
| — | 515-241 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-242 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-243 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-244 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-245 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-246 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-247 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-248 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-249 | none assigned yet which blocks → | UNITED STATES CELLULAR - IA | 6266 | DES MOINES | IA |
| — | 515-250 | none assigned yet which blocks → | UNITED STATES CELLULAR - IA | 6266 | DES MOINES | IA |
| — | 515-251 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-252 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-253 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-254 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-255 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-256 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-258 | not yet reported which blocks → | IOWA NETWORK SVCS INC DBA AUREON NTWK SVCS, INC. | 8858 | DES MOINES | IA |
| — | 515-261 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-262 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-263 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-264 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-265 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-266 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-267 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-268 | not yet reported which blocks → | QWEST CORPORATION | 9631 | AMES | IA |
| — | 515-270 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-271 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-272 | 0XXX2XXX5XXX7XXX · 3 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH | 1167 | SWEA CITY | IA |
| — | 515-273 | none assigned yet which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-274 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-275 | not yet reported which blocks → | OGDEN TEL. CO. | 1263 | OGDEN | IA |
| — | 515-276 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-277 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-278 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-279 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-280 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-281 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-282 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-283 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-284 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-285 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-286 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | IA |
| — | 515-287 | not yet reported which blocks → | QWEST CORPORATION | 9631 | DES MOINES | 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.