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 617
VERIZON NEW ENGLAND INC. 334
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 71
NEW CINGULAR WIRELESS PCS, LLC - DC 68
PAETEC ITEL, LLC 44
TC SYSTEMS, INC. 41
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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 617-723 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-724 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-725 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-726 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-727 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-728 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-729 1XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 QUINCY MA
— 617-730 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BROOKLINE MA
— 617-731 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BROOKLINE MA
— 617-732 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BROOKLINE MA
— 617-733 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
— 617-734 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BROOKLINE MA
— 617-735 0XXX5XXX6XXX7XXX · 2 holders which blocks → VERIZON NEW ENGLAND INC. 9102 BROOKLINE MA
— 617-736 not yet reported which blocks → MA
— 617-737 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-738 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BROOKLINE MA
— 617-739 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BROOKLINE MA
— 617-740 9XXX which blocks → VERIZON NEW ENGLAND INC. 9102 DORCHESTER MA
— 617-741 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 SOMERVILLE MA
— 617-742 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-743 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-744 2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J WATERTOWN MA
— 617-745 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 QUINCY MA
— 617-746 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BRIGHTON MA
— 617-747 not yet reported which blocks → TC SYSTEMS, INC. 7135 BOSTON MA
— 617-748 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-749 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - MA 892D ROXBURY MA
— 617-750 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 QUINCY MA
— 617-751 0XXX1XXX2XXX3XXX5XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BROOKLINE MA
— 617-752 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SO BOSTON MA
— 617-753 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-754 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BROOKLINE MA
— 617-755 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BOSTON MA
— 617-757 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-758 1XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J CAMBRIDGE MA
— 617-759 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DEDHAM MA
— 617-760 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-761 7XXX which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA
— 617-762 1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 NEWTON MA
— 617-763 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BOSTON MA
— 617-764 3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J SOMERVILLE MA
— 617-766 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → TC SYSTEMS, INC. 7135 SO BOSTON MA
— 617-768 7XXX which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA
— 617-769 2XXX8XXX9XXX · 3 holders which blocks → VERIZON NEW ENGLAND INC. 9102 QUINCY MA
— 617-770 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 QUINCY MA
— 617-771 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MALDEN MA
— 617-772 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-773 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 QUINCY MA
— 617-774 none assigned yet which blocks → VERIZON NEW ENGLAND INC. 9102 QUINCY MA
— 617-775 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEWTON MA

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.