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
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Quick find in this area code:
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| — | 585-883 | 0–9 XXXall 10 · 7 holders which blocks → | ONVOY, LLC- NY | 384C | MT MORRIS | NY |
| — | 585-889 | not yet reported which blocks → | FRONTIER TELEPHONE OF ROCHESTER, INC. | 0121 | SCOTTSVL | NY |
| — | 585-899 | 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → | FRONTIER TELEPHONE OF ROCHESTER, INC. | 0121 | EROCHESTER | NY |
| — | 585-900 | 0–9 XXXall 10 · 6 holders which blocks → | ONVOY, LLC- NY | 384C | CHAFFEE | NY |
| — | 585-902 | 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - NY | 4006 | ALDEN | NY |
| — | 585-911 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | NY |
| — | 585-919 | 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 7 holders which blocks → | PAETEC ITEL, LLC | 829J | CANANDAGUA | NY |
| — | 585-921 | not yet reported which blocks → | FRONTIER TELEPHONE OF ROCHESTER, INC. | 0121 | ROCHESTER | NY |
| — | 585-922 | not yet reported which blocks → | FRONTIER TELEPHONE OF ROCHESTER, INC. | 0121 | ROCHESTER | NY |
| — | 585-924 | not yet reported which blocks → | FRONTIER TELEPHONE OF ROCHESTER, INC. | 0121 | VICTOR | NY |
| — | 585-928 | 0XXX3XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → | VERIZON NEW YORK, INC. | 9104 | BOLIVAR | NY |
| — | 585-933 | 0XXX1XXX2XXX4XXX5XXX9XXX · 2 holders which blocks → | TERRA NOVA TELECOM INC. | 145J | OLEAN | NY |
| — | 585-935 | 1XXX7XXX · 2 holders which blocks → | FRONTIER TELEPHONE OF ROCHESTER, INC. | 0121 | ROCHESTER | NY |
| — | 585-936 | not yet reported which blocks → | FRONTIER TELEPHONE OF ROCHESTER, INC. | 0121 | ROCHESTER | NY |
| — | 585-937 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 7 holders which blocks → | ONVOY SPECTRUM, LLC | 624H | ALDEN | NY |
| — | 585-939 | 4XXX5XXX6XXX7XXX · 2 holders which blocks → | FRONTIER TELEPHONE OF ROCHESTER, INC. | 0121 | ROCHESTER | NY |
| — | 585-943 | not yet reported which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY | 6959 | ROCHESTER | NY |
| — | 585-944 | not yet reported which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY | 6959 | ROCHESTER | NY |
| — | 585-948 | 0XXX1XXX2XXX3XXX4XXX6XXX7XXX · 5 holders which blocks → | VERIZON NEW YORK, INC. | 9104 | OAKFIELD | NY |
| — | 585-950 | not yet reported which blocks → | NY | |||
| — | 585-955 | 3XXX which blocks → | FRONTIER TELEPHONE OF ROCHESTER, INC. | 0121 | ROCHESTER | NY |
| — | 585-956 | not yet reported which blocks → | FRONTIER TELEPHONE OF ROCHESTER, INC. | 0121 | XXXXXXXXXX | NY |
| — | 585-957 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY | 7133 | ROCHESTER | NY |
| — | 585-958 | not yet reported which blocks → | NY | |||
| — | 585-959 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | NY |
| — | 585-964 | 1XXX4XXX6XXX · 3 holders which blocks → | FRONTIER TELEPHONE OF ROCHESTER, INC. | 0121 | HAMLIN | NY |
| — | 585-966 | 2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → | FRONTIER TELEPHONE OF ROCHESTER, INC. | 0121 | ROCHESTER | NY |
| — | 585-967 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | ROCHESTER | NY |
| — | 585-968 | 4XXX6XXX7XXX9XXX · 4 holders which blocks → | VERIZON NEW YORK, INC. | 9104 | CUBA | NY |
| — | 585-971 | not yet reported which blocks → | FRONTIER TELEPHONE OF ROCHESTER, INC. | 0121 | XXXXXXXXXX | NY |
| — | 585-973 | 0XXX1XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → | VERIZON NEW YORK, INC. | 9104 | FRIENDSHIP | NY |
| — | 585-974 | not yet reported which blocks → | FRONTIER TELEPHONE OF ROCHESTER, INC. | 0121 | ROCHESTER | NY |
| — | 585-975 | none assigned yet which blocks → | FRONTIER TELEPHONE OF ROCHESTER, INC. | 0121 | ROCHESTER | NY |
| — | 585-976 | not yet reported which blocks → | NY | |||
| — | 585-977 | not yet reported which blocks → | VERIZON NEW YORK, INC. | 9104 | XXXXXXXXXX | NY |
| — | 585-978 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | ROCHESTER | NY |
| — | 585-986 | 0XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → | ONVOY, LLC- NY | 384C | RUSH | NY |
| — | 585-987 | not yet reported which blocks → | FRONTIER TELEPHONE OF ROCHESTER, INC. | 0121 | ROCHESTER | NY |
| — | 585-988 | not yet reported which blocks → | NY | |||
| — | 585-991 | 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → | PAETEC ITEL, LLC | 829J | GENESEO | NY |
| — | 585-993 | 4XXX7XXX8XXX9XXX · 4 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | BATAVIA | NY |
| — | 585-999 | 0–9 XXXall 10 · 5 holders which blocks → | ONVOY, LLC- NY | 384C | JAVA | NY |
| — | 586-201 | not yet reported which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | MT CLEMENS | MI |
| — | 586-202 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | WARREN | MI |
| — | 586-206 | not yet reported which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | MT CLEMENS | MI |
| — | 586-211 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | MI |
| — | 586-212 | not yet reported which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | MT CLEMENS | MI |
| — | 586-214 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | WARREN | MI |
| — | 586-215 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | WARREN | MI |
| — | 586-216 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | WARREN | MI |
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.