NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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
— 585-589 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 ALBION NY
— 585-590 0XXX1XXX2XXX4XXX6XXX7XXX9XXX which blocks → VERIZON NEW YORK, INC. 9104 ALBION NY
— 585-591 5XXX6XXX7XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 ATTICA NY
— 585-593 8XXX which blocks → VERIZON NEW YORK, INC. 9104 WELLSVILLE NY
— 585-594 not yet reported which blocks → OGDEN TELCO NY DBA FRONTIER OGDEN TELEPHONE CO 0110 SPENCERPT NY
— 585-596 0XXX1XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 WELLSVILLE NY
— 585-598 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J FAIRPORT NY
— 585-599 1XXX7XXX8XXX · 3 holders which blocks → CITIZENS TELECOMM CO OF NY DBA FRONTIER COMM OF NY 0096 CORFU NY
— 585-607 not yet reported which blocks → NY
— 585-610 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → TC SYSTEMS, INC. - NY 7140 WELLSVILLE NY
— 585-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NY
— 585-612 0XXX1XXX2XXX3XXX4XXX5XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J DANSVILLE NY
— 585-613 1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → TC SYSTEMS, INC. - NY 7140 ROCHESTER NY
— 585-615 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 ROCHESTER NY
— 585-621 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
— 585-624 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 HONEOYEFLS NY
— 585-636 0–9 XXXall 10 · 7 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K HAMLIN NY
— 585-637 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 BROCKPORT NY
— 585-638 0XXX1XXX2XXX3XXX9XXX · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 HOLLEY NY
— 585-641 1XXX6XXX7XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J EROCHESTER NY
— 585-645 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 WEBSTER NY
— 585-647 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
— 585-648 0–9 XXXall 10 · 7 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J WELLSVILLE NY
— 585-652 0XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 EASTAURORA NY
— 585-654 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
— 585-655 3XXX4XXX6XXX7XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 EASTAURORA NY
— 585-657 2XXX3XXX · 2 holders which blocks → FRONTIER COMMUNICATIONS OF SENECA GORHAM, INC. 0122 HOLCOMB NY
— 585-658 1XXX which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 MT MORRIS NY
— 585-659 0XXX1XXX3XXX4XXX6XXX7XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 KENDALL NY
— 585-663 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
— 585-667 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 WEBSTER NY
— 585-669 3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 SPRINGWTR NY
— 585-670 2XXX3XXX6XXX · 3 holders which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 W WEBSTER NY
— 585-671 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 W WEBSTER NY
— 585-676 0–9 XXXall 10 · 7 holders which blocks → VERIZON NEW YORK, INC. 9104 FRANKLINVL NY
— 585-680 not yet reported which blocks → NY
— 585-682 0XXX1XXX2XXX6XXX7XXX8XXX · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 WATERPORT NY
— 585-687 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 EASTAURORA NY
— 585-697 4XXX which blocks → PAETEC ITEL, LLC 829J ROCHESTER NY
— 585-700 not yet reported which blocks → NY
— 585-701 none assigned yet which blocks → PAETEC ITEL, LLC 829J OLEAN NY
— 585-703 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
— 585-704 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
— 585-705 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ROCHESTER NY
— 585-708 0–9 XXXall 10 · 5 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K ATTICA NY
— 585-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NY
— 585-714 0–9 XXXall 10 · 7 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J EASTAURORA NY
— 585-716 not yet reported which blocks → NY
— 585-719 4XXX5XXX6XXX7XXX which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
— 585-720 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY

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.