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 631
VERIZON NEW YORK, INC. 230
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 64
OMNIPOINT COMMUNICATIONS, INC. - NY 55
CABLEVISION LIGHTPATH, INC. - NY 55
LEVEL 3 COMMUNICATIONS, LLC - NY 53
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
— 631-553 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 BRENTWOOD NY
— 631-554 not yet reported which blocks → SPOK, INC. 6630 BRENTWOOD NY
— 631-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST NY
— 631-557 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLC- NY 384C AMAGANSETT NY
— 631-558 not yet reported which blocks → SPOK, INC. 6630 RIVERHEAD NY
— 631-561 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → TC SYSTEMS, INC. - NY 7140 SELDEN NY
— 631-563 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 SAYVILLE NY
— 631-564 not yet reported which blocks → PAETEC ITEL, LLC 829J SAYVILLE NY
— 631-567 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 SAYVILLE NY
— 631-568 0–9 XXXall 10 · 3 holders which blocks → HD CARRIER LLC 321J AMITYVILLE NY
— 631-570 2XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 FIREISLAND NY
— 631-574 0XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J RIVERHEAD NY
— 631-576 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 PATCHOGUE NY
— 631-577 none assigned yet which blocks → VERIZON NEW YORK, INC. 9104 FARMINGDL NY
— 631-580 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 RONKONKOMA NY
— 631-581 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 ISLIP NY
— 631-582 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 CENTRAISLP NY
— 631-583 1XXX3XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 FIREISLAND NY
— 631-584 1XXX which blocks → VERIZON NEW YORK, INC. 9104 ST JAMES NY
— 631-585 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 RONKONKOMA NY
— 631-586 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 DEER PARK NY
— 631-587 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 BABYLON NY
— 631-588 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 RONKONKOMA NY
— 631-589 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 SAYVILLE NY
— 631-590 0XXX1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 RONKONKOMA NY
— 631-591 0XXX1XXX2XXX3XXX6XXX · 2 holders which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 RIVERHEAD NY
— 631-592 none assigned yet which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 LINDENHST NY
— 631-593 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 GREENPORT NY
— 631-595 0XXX3XXX4XXX5XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 DEER PARK NY
— 631-597 0XXX1XXX2XXX3XXX5XXX8XXX · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 E FIRE IS NY
— 631-598 5XXX9XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 AMITYVILLE NY
— 631-599 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 RIVERHEAD NY
— 631-600 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC- NY 384C W COMMACK NY
— 631-603 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J RIVERHEAD NY
— 631-608 none assigned yet which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 AMITYVILLE NY
— 631-610 3XXX6XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 EASTPORT NY
— 631-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NY
— 631-612 0XXX1XXX3XXX4XXX6XXX7XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 BABYLON NY
— 631-613 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLC- NY 384C BRIDGEMPTN NY
— 631-614 not yet reported which blocks → ONVOY, LLC- NY 384C SOUTHAMPTN NY
— 631-615 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 RONKONKOMA NY
— 631-618 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 YAPHANK NY
— 631-619 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. - NY 7140 RONKONKOMA NY
— 631-621 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 ST JAMES NY
— 631-622 not yet reported which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 FARMINGDL NY
— 631-623 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. - NY 7140 W COMMACK NY
— 631-625 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLC- NY 384C ORIENT NY
— 631-628 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 NORTHPORT NY
— 631-630 not yet reported which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 CENTRAISLP NY
— 631-632 0XXX which blocks → VERIZON NEW YORK, INC. 9104 STONYBROOK 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.