NumberResearch Membership · Data 09/30/2026

Recent prefix assignments

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

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
Rogers Communications Canada Inc. (Wireless) 46
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 27
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
New assignments by month Oct 2026 Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025
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Quick find in this area code:
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 516-545 0XXX1XXX7XXX9XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 NASSAUZN08 NY
— 516-546 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 NASSAUZN06 NY
— 516-548 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC- NY 384C NASSAUZN06 NY
— 516-549 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NASSAUZN02 NY
— 516-551 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 NASSAUZN05 NY
— 516-554 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NASSAUZN05 NY
— 516-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST NY
— 516-558 4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NASSAUZN07 NY
— 516-559 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → VERIZON NEW YORK, INC. 9104 NASSAUZN05 NY
— 516-560 0XXX1XXX3XXX4XXX5XXX7XXX9XXX · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 NASSAUZN05 NY
— 516-561 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 NASSAUZN03 NY
— 516-562 none assigned yet which blocks → VERIZON NEW YORK, INC. 9104 NASSAUZN01 NY
— 516-564 2XXX3XXX7XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 NASSAUZN05 NY
— 516-565 7XXX8XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 NASSAUZN05 NY
— 516-566 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 NASSAUZN05 NY
— 516-568 4XXX5XXX7XXX8XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 NASSAUZN03 NY
— 516-569 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 NASSAUZN03 NY
— 516-570 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NASSAUZN01 NY
— 516-571 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 NASSAUZN05 NY
— 516-572 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 NASSAUZN05 NY
— 516-573 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 NASSAUZN05 NY
— 516-574 1XXX2XXX3XXX9XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 NASSAUZN02 NY
— 516-575 8XXX which blocks → VERIZON NEW YORK, INC. 9104 NASSAUZN08 NY
— 516-576 4XXX which blocks → VERIZON NEW YORK, INC. 9104 NASSAUZN08 NY
— 516-577 0XXX which blocks → VERIZON NEW YORK, INC. 9104 FARMINGDL NY
— 516-578 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 NASSAUZN05 NY
— 516-579 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 NASSAUZN08 NY
— 516-584 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 NASSAUZN07 NY
— 516-586 0–9 XXXall 10 · 5 holders which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 FARMINGDL NY
— 516-588 0–9 XXXall 10 · 6 holders which blocks → PAETEC ITEL, LLC 829J NASSAUZN07 NY
— 516-592 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 NASSAUZN05 NY
— 516-593 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 NASSAUZN03 NY
— 516-594 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 NASSAUZN06 NY
— 516-596 5XXX7XXX8XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 NASSAUZN03 NY
— 516-598 none assigned yet which blocks → VERIZON NEW YORK, INC. 9104 AMITYVILLE NY
— 516-599 9XXX which blocks → VERIZON NEW YORK, INC. 9104 NASSAUZN03 NY
— 516-600 0–9 XXXall 10 · 6 holders which blocks → HD CARRIER LLC 321J NASSAUZN06 NY
— 516-605 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 NASSAUZN08 NY
— 516-606 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NASSAUZN07 NY
— 516-607 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 CENTRAISLP NY
— 516-608 none assigned yet which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 NASSAUZN06 NY
— 516-609 5XXX7XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 NASSAUZN04 NY
— 516-610 0XXX2XXX · 2 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 NASSAUZN05 NY
— 516-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NY
— 516-612 1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 NASSAUZN03 NY
— 516-616 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 NASSAUZN02 NY
— 516-617 none assigned yet which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 SELDEN NY
— 516-619 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 NASSAUZN03 NY
— 516-620 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NASSAUZN05 NY
— 516-621 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 NASSAUZN04 NY

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/30/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.