NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

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, all time — NPA 585
FRONTIER TELEPHONE OF ROCHESTER, INC. 186
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 69
ONVOY, LLC- NY 56
NEW CINGULAR WIRELESS PCS, LLC - DC 47
VERIZON NEW YORK, INC. 40
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
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 585-815 0XXX2XXX3XXX4XXX5XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J BATAVIA NY
— 585-820 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 ROCHESTER NY
— 585-865 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
— 585-866 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC- NY 384C MIDDLEPORT NY
— 585-869 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 7 holders which blocks → PAETEC ITEL, LLC 829J VICTOR NY
— 585-872 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 WEBSTER NY
— 585-880 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
— 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

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.