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.
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| — | 319-887 | not yet reported which blocks → | QWEST CORPORATION | 9631 | IOWA CITY | IA |
| — | 319-888 | 0–9 XXXall 10 · 7 holders which blocks → | CENTURYLINK COMMUNICATIONS, LLC | 508J | WATERLOO | IA |
| — | 319-892 | not yet reported which blocks → | PAETEC ITEL, LLC | 829J | CEDAR RPDS | IA |
| — | 319-895 | 1XXX2XXX3XXX7XXX · 2 holders which blocks → | QWEST CORPORATION | 9631 | MT VERNON | IA |
| — | 319-896 | not yet reported which blocks → | QWEST CORPORATION | 9631 | CEDAR RPDS | IA |
| — | 319-899 | 8XXX which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA | 6570 | CEDAR RPDS | IA |
| — | 319-911 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | IA |
| — | 319-929 | none assigned yet which blocks → | UNITED STATES CELLULAR - IA | 6266 | CEDAR RPDS | IA |
| — | 319-930 | 3XXX9XXX · 2 holders which blocks → | UNITED STATES CELLULAR - IA | 6266 | IOWA CITY | IA |
| — | 319-931 | 9XXX which blocks → | UNITED STATES CELLULAR - IA | 6266 | MTPLEASANT | IA |
| — | 319-934 | not yet reported which blocks → | EAST BUCHANAN TEL. COOP. | 1156 | QUASQUETON | IA |
| — | 319-935 | not yet reported which blocks → | EAST BUCHANAN TEL. COOP. | 1156 | WINTHROP | IA |
| — | 319-936 | not yet reported which blocks → | T-MOBILE USA, INC. | 6529 | IOWA CITY | IA |
| — | 319-937 | not yet reported which blocks → | MEDIAPOLIS TEL. CO. | 1251 | KINGSTON | IA |
| — | 319-938 | 3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. | 1178 | ROWLEY | IA |
| — | 319-939 | none assigned yet which blocks → | UNITED STATES CELLULAR - IA | 6266 | WATERLOO | IA |
| — | 319-950 | not yet reported which blocks → | IA | |||
| — | 319-958 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | IA | |
| — | 319-959 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | IA | |
| — | 319-961 | not yet reported which blocks → | T-MOBILE USA, INC. | 6529 | WATERLOO | IA |
| — | 319-976 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | IA |
| — | 319-981 | not yet reported which blocks → | T-MOBILE USA, INC. | 6529 | CEDAR RPDS | IA |
| — | 319-983 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | QWEST CORPORATION | 9631 | PARKERSBG | IA |
| — | 319-984 | 0XXX1XXX2XXX3XXX4XXX7XXX8XXX · 2 holders which blocks → | QWEST CORPORATION | 9631 | DENVER | IA |
| — | 319-985 | not yet reported which blocks → | MEDIAPOLIS TEL. CO. | 1251 | DODGEVILLE | IA |
| — | 319-986 | not yet reported which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. | 1178 | MTPLEASANT | IA |
| — | 319-987 | 4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → | WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS | 1170 | JANESVILLE | IA |
| — | 319-988 | 0XXX1XXX2XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | QWEST CORPORATION | 9631 | HUDSON | IA |
| — | 319-989 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | QWEST CORPORATION | 9631 | PARKERSBG | 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.