NumberResearchRecent 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.
Most active assignees, last 30 days
New assignments by month
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Oct 2025
Quick find in this area code:
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| — | 605-529 | not yet reported which blocks → | ALLIANCE COMMUNICATIONS COOPERATIVE, INC. (BALTIC) | 1642 | BALTIC | SD |
| — | 605-530 | 6XXX8XXX · 2 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | FLANDREAU | SD |
| — | 605-532 | not yet reported which blocks → | INTERSTATE TELECOM COOP, INC. - SD | 1651 | CLARK | SD |
| — | 605-533 | not yet reported which blocks → | RED RIVER RURAL TEL ASSN DBA RED RIVER COMM - ND | 1631 | SOLIDGERWD | SD |
| — | 605-534 | 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → | QWEST CORPORATION | 9631 | FLANDREAU | SD |
| — | 605-535 | not yet reported which blocks → | GOLDEN WEST TEL COOP INC DBA GOLDEN WEST TELECOMM | 1659 | OELRICHS | SD |
| — | 605-537 | not yet reported which blocks → | VENTURE COMMUNICATIONS COOPERATIVE | 1680 | ROSHOLT | SD |
| — | 605-538 | not yet reported which blocks → | CHEYENNE RIVER SIOUX TRIBAL TEL. AUTHORITY | 1647 | DUPREE | SD |
| — | 605-539 | not yet reported which blocks → | VENTURE COMMUNICATIONS COOPERATIVE | 1680 | WESIGTNSPG | SD |
| — | 605-542 | not yet reported which blocks → | INTERSTATE TELECOM COOP, INC. - SD | 1651 | ELKTON | SD |
| — | 605-543 | not yet reported which blocks → | ALLIANCE COMMUNICATIONS COOPERATIVE, INC. (BALTIC) | 1642 | CROOKS | SD |
| — | 605-544 | not yet reported which blocks → | GOLDEN WEST TEL COOP INC DBA GOLDEN WEST TELECOMM | 1659 | MILESVILLE | SD |
| — | 605-546 | 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | QWEST CORPORATION | 9631 | IROQUOIS | SD |
| — | 605-547 | none assigned yet which blocks → | HEARTLAND TELECO OF IA DBA PREMIER COMMUNICATIONS | 1109 | W HAWARDEN | SD |
| — | 605-552 | not yet reported which blocks → | CLARITY TELECOM, LLC DBA BLUEPEAK | 7024 | CENTERVL | SD |
| — | 605-555 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | DIR ASST | SD |
| — | 605-557 | not yet reported which blocks → | VIVIAN TEL CO DBA GOLDEN WEST TELECOMMUNICATIONS | 1686 | CLEARFIELD | SD |
| — | 605-563 | not yet reported which blocks → | FORT RANDALL TELCO DBA MT RUSHMORE TELEPHONE CO | 1660 | CENTERVL | SD |
| — | 605-564 | not yet reported which blocks → | CONSOLIDATED TELCOM | 1607 | SOHETTINGR | SD |
| — | 605-565 | none assigned yet which blocks → | HEARTLAND TELECO OF IA DBA PREMIER COMMUNICATIONS | 1109 | WEST AKRON | SD |
| — | 605-566 | 0XXX3XXX4XXX5XXX6XXX7XXX which blocks → | ONVOY, LLC - SD | 162G | SPEARFISH | SD |
| — | 605-567 | not yet reported which blocks → | GOLDEN WEST TEL COOP INC DBA GOLDEN WEST TELECOMM | 1659 | HAYES | SD |
| — | 605-571 | none assigned yet which blocks → | MIDCONTINENT COMMUNICATIONS. - SD | 7076 | SPEARFISH | SD |
| — | 605-573 | not yet reported which blocks → | CLARITY TELECOM, LLC DBA BLUEPEAK | 7024 | FLANDREAU | SD |
| — | 605-574 | 0XXX1XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | QWEST CORPORATION | 9631 | HILL CITY | SD |
| — | 605-575 | not yet reported which blocks → | QWEST CORPORATION | 9631 | SIOUX FLS | SD |
| — | 605-576 | not yet reported which blocks → | CONSOLIDATED TELCOM | 1607 | SOUTH LADD | SD |
| — | 605-577 | not yet reported which blocks → | VALLEY TELECOM COOP. ASSN., INC. | 1685 | LONG LAKE | SD |
| — | 605-578 | 0XXX6XXX · 2 holders which blocks → | QWEST CORPORATION | 9631 | SPEARFISH | SD |
| — | 605-580 | 2XXX3XXX9XXX which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD | 6569 | SPEARFISH | SD |
| — | 605-582 | not yet reported which blocks → | ALLIANCE COMM. COOPERATIVE, INC. (SPLIT ROCK) | 1657 | BRANDON | SD |
| — | 605-583 | not yet reported which blocks → | VIVIAN TEL CO DBA GOLDEN WEST TELECOMMUNICATIONS | 1686 | SCOTLAND | SD |
| — | 605-584 | not yet reported which blocks → | QWEST CORPORATION | 9631 | SPEARFISH | SD |
| — | 605-586 | not yet reported which blocks → | INTERSTATE TELECOM COOP, INC. - SD | 1651 | NUNDA | SD |
| — | 605-587 | not yet reported which blocks → | NORTHEAST NEBRASKA TEL. CO. | 1576 | NO BRISTOW | SD |
| — | 605-589 | not yet reported which blocks → | FORT RANDALL TELCO DBA MT RUSHMORE TELEPHONE CO | 1660 | TYNDALL | SD |
| — | 605-591 | 1XXX6XXX · 2 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SD | 6569 | SPEARFISH | SD |
| — | 605-593 | 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - SD | 5180 | RAPID CITY | SD |
| — | 605-594 | not yet reported which blocks → | ALLIANCE COMM. COOPERATIVE, INC. (SPLIT ROCK) | 1657 | GARRETSON | SD |
| — | 605-595 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → | AT&T - LOCAL | 7421 | SIOUX FLS | SD |
| — | 605-596 | not yet reported which blocks → | VENTURE COMMUNICATIONS COOPERATIVE | 1680 | TULARE | SD |
| — | 605-598 | not yet reported which blocks → | VENTURE COMMUNICATIONS COOPERATIVE | 1680 | FAULKTON | SD |
| — | 605-599 | 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | QWEST CORPORATION | 9631 | CAVOUR | SD |
| — | 605-609 | not yet reported which blocks → | LEVEL 3 COMMUNICATIONS, LLC - SD | 5180 | PIERRE | SD |
| — | 605-610 | 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - SD | 5180 | SIOUX FLS | SD |
| — | 605-611 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | SD |
| — | 605-620 | 0XXX1XXX2XXX6XXX7XXX9XXX · 4 holders which blocks → | ONVOY, LLC - SD | 162G | LK PRESTON | SD |
| — | 605-622 | 0XXX1XXX6XXX8XXX9XXX · 3 holders which blocks → | QWEST CORPORATION | 9631 | ABERDEEN | SD |
| — | 605-623 | not yet reported which blocks → | INTERSTATE TELECOM COOP, INC. - SD | 1651 | REVILLO | SD |
| — | 605-624 | not yet reported which blocks → | QWEST CORPORATION | 9631 | VERMILLION | SD |
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.