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
2007-04-05 585-252 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 PAVILION NY
2007-02-24 585-209 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 CUBA NY
2007-02-08 585-284 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ROCHESTER NY
2007-02-08 585-285 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ROCHESTER NY
2007-02-08 585-286 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ROCHESTER NY
2007-01-16 585-205 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 MIDDLEPORT NY
2007-01-16 585-206 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J HOLLEY NY
2006-10-18 585-653 0–9 XXXall 10 · 6 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K ARCADE NY
2006-10-17 585-572 0–9 XXXall 10 · 6 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K LIVONIA NY
2006-10-11 585-831 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2006-10-05 585-299 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K CHURCHVL NY
2006-10-05 585-678 0–9 XXXall 10 · 5 holders which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 FAIRPORT NY
2006-09-22 585-773 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 ROCHESTER NY
2006-09-13 585-689 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 BLISS NY
2006-09-13 585-794 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2006-08-31 585-754 0–9 XXXall 10 · 3 holders which blocks → PAETEC ITEL, LLC 829J ROCHESTER NY
2006-07-10 585-497 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 HONEOYEFLS NY
2006-06-12 585-698 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2006-05-22 585-690 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2006-05-11 585-627 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC- NY 384C ROCHESTER NY
2006-04-14 585-857 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2006-04-03 585-531 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NAPLES NY
2006-03-09 585-402 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2006-02-03 585-643 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 EROCHESTER NY
2006-01-11 585-360 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 ROCHESTER NY
2005-12-28 585-861 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 BATAVIA NY
2005-10-14 585-490 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2005-09-14 585-730 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2005-08-12 585-478 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2005-06-10 585-208 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2005-05-25 585-204 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K DANSVILLE NY
2005-05-17 585-753 0–9 XXXwhole prefix which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
2005-04-11 585-406 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2005-03-23 585-558 0–9 XXXall 10 · 7 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K WARSAW NY
2005-03-08 585-469 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2005-02-08 585-410 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2005-02-02 585-672 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 ROCHESTER NY
2004-10-14 585-489 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2004-08-31 585-662 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 TELECOM OF NEW YORK, LP - NY 8473 EROCHESTER NY
2004-08-19 585-413 0–9 XXXall 10 · 4 holders which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
2004-08-03 585-301 0–9 XXXall 10 · 4 holders which blocks → PAETEC ITEL, LLC 829J ROCHESTER NY
2004-07-25 585-297 0–9 XXXall 10 · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 BATAVIA NY
2004-06-24 585-472 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ROCHESTER NY
2004-05-17 585-200 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 EROCHESTER NY
2004-05-14 585-298 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ROCHESTER NY
2004-05-07 585-354 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ROCHESTER NY
2004-04-30 585-269 0–9 XXXall 10 · 4 holders which blocks → TC SYSTEMS, INC. - NY 7140 ROCHESTER NY
2004-03-10 585-213 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WAYLAND NY
2003-09-29 585-278 0–9 XXXall 10 · 4 holders which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
2003-06-05 585-228 0–9 XXXall 10 · 6 holders which blocks → TC SYSTEMS, INC. - NY 7140 WARSAW 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.