NumberResearch Membership · Data 09/29/2026

Recent prefix assignments

347 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/29/2026

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, last 30 days
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
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
— 585-488 0–9 XXXall 10 · 6 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J SPENCERPT NY
— 585-492 6XXX8XXX9XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 ARCADE NY
— 585-493 1XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 CASTILE NY
— 585-494 5XXX6XXX7XXX8XXX · 4 holders which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 BERGEN NY
— 585-495 1XXX2XXX4XXX · 3 holders which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 WYOMING NY
— 585-496 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 CHAFFEE NY
— 585-502 0–9 XXXall 10 · 7 holders which blocks → PAETEC ITEL, LLC 829J LE ROY NY
— 585-506 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
— 585-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NY
— 585-520 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ROCHESTER NY
— 585-521 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
— 585-525 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
— 585-526 2XXX3XXX8XXX · 3 holders which blocks → FRONTIER COMMUNICATIONS OF SENECA GORHAM, INC. 0122 STANLEY NY
— 585-527 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
— 585-528 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
— 585-529 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
— 585-530 0XXX7XXX9XXX which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
— 585-533 0XXX3XXX4XXX5XXX7XXX8XXX · 5 holders which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 RUSH NY
— 585-534 1XXX2XXX3XXX6XXX7XXX8XXX · 4 holders which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ATLANTA NY
— 585-535 1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 VARYSBURG NY
— 585-537 0–9 XXXall 10 · 6 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 ROCHESTER NY
— 585-538 7XXX8XXX · 2 holders which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 CALEDONIA NY
— 585-542 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 AKRON NY
— 585-543 0XXX1XXX4XXX6XXX7XXX · 5 holders which blocks → TC SYSTEMS, INC. - NY 7140 OLEAN NY
— 585-544 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
— 585-545 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J WEBSTER NY
— 585-546 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
— 585-547 0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → CITIZENS TELECOMM CO OF NY DBA FRONTIER COMM OF NY 0096 DARIEN NY
— 585-548 0XXX1XXX3XXX4XXX5XXX6XXX8XXX · 6 holders which blocks → VERIZON NEW YORK, INC. 9104 BYRON NY
— 585-554 1XXX2XXX7XXX8XXX · 4 holders which blocks → FRONTIER COMMUNICATIONS OF SENECA GORHAM, INC. 0122 RUSHVILLE NY
— 585-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST NY
— 585-563 0–9 XXXall 10 · 3 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K ROCHESTER NY
— 585-567 3XXX7XXX · 2 holders which blocks → CITIZENS TELECOMM CO OF NY DBA FRONTIER COMM OF NY 0096 FILLMORE NY
— 585-568 0–9 XXXall 10 · 6 holders which blocks → PAETEC ITEL, LLC 829J ROCHESTER NY
— 585-571 0–9 XXXall 10 · 7 holders which blocks → PAETEC ITEL, LLC 829J SCOTTSVL NY
— 585-576 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 ROCHESTER NY
— 585-581 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
— 585-582 0XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 HONEOYEFLS NY
— 585-584 1XXX4XXX6XXX · 2 holders which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 PAVILION NY
— 585-585 not yet reported which blocks → NY
— 585-586 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 EROCHESTER NY
— 585-587 not yet reported which blocks → NY
— 585-588 not yet reported which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
— 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

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.