NumberResearchRecent prefix assignments
2 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026
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 |
|---|---|---|---|---|---|---|
| — | 810-941 | 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - MI | 770E | PORT HURON | MI |
| — | 810-950 | not yet reported which blocks → | MI | |||
| — | 810-953 | 2XXX8XXX · 2 holders which blocks → | MICHIGAN BELL TEL CO | 9323 | GRANDBLANC | MI |
| — | 810-955 | 0–9 XXXwhole prefix which blocks → | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | FLINT | MI |
| — | 810-956 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7279 | PORT HURON | MI |
| — | 810-957 | 0–9 XXXall 10 · 5 holders which blocks → | CLEAR RATE COMMUNICATIONS, LLC | 046L | LINDEN | MI |
| — | 810-958 | 9XXX which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7279 | PORT HURON | MI |
| — | 810-959 | not yet reported which blocks → | MI | |||
| — | 810-962 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | FLINT | MI |
| — | 810-963 | 3XXX9XXX which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7279 | FLINT | MI |
| — | 810-964 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | FLINT | MI |
| — | 810-965 | 0–9 XXXall 10 · 2 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | FLINT | MI |
| — | 810-966 | 6XXX which blocks → | MICHIGAN BELL TEL CO | 9323 | PORT HURON | MI |
| — | 810-971 | not yet reported which blocks → | SPOK, INC. | 6630 | PORT HURON | MI |
| — | 810-972 | not yet reported which blocks → | AMERICAN MESSAGING SERVICES, LLC | 9748 | FLINT | MI |
| — | 810-973 | not yet reported which blocks → | SPOK, INC. | 6630 | LAPEER | MI |
| — | 810-976 | not yet reported which blocks → | MI | |||
| — | 810-982 | not yet reported which blocks → | MICHIGAN BELL TEL CO | 9323 | PORT HURON | MI |
| — | 810-984 | not yet reported which blocks → | MICHIGAN BELL TEL CO | 9323 | PORT HURON | MI |
| — | 810-985 | not yet reported which blocks → | MICHIGAN BELL TEL CO | 9323 | PORT HURON | MI |
| — | 810-987 | not yet reported which blocks → | MICHIGAN BELL TEL CO | 9323 | PORT HURON | MI |
| — | 810-989 | not yet reported which blocks → | MICHIGAN BELL TEL CO | 9323 | PORT HURON | MI |
| — | 810-990 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - MI | 770E | PORT HURON | MI |
| — | 810-999 | not yet reported which blocks → | MICHIGAN BELL TEL CO | 9323 | XXXXXXXXXX | MI |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.